18469440 has 252 divisors, whose sum is σ = 71144892. Its totient is φ = 4392960.

The previous prime is 18469439. The next prime is 18469441. The reversal of 18469440 is 4496481.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18469439) and next prime (18469441).

It can be written as a sum of positive squares in 2 ways, for example, as 10036224 + 8433216 = 3168^2 + 2904^2 .

It is a super-2 number, since 2×18469440² = 682240427827200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 18469395 and 18469404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18469441) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 348454 + ... + 348506.

It is an arithmetic number, because the mean of its divisors is an integer number (282321).

Almost surely, 2^18469440 is an apocalyptic number.

18469440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18469440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35572446).

18469440 is an abundant number, since it is smaller than the sum of its proper divisors (52675452).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18469440 is a wasteful number, since it uses less digits than its factorization.

18469440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98 (or 74 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 18469440 is about 4297.6086373703. The cubic root of 18469440 is about 264.3329133414.

The spelling of 18469440 in words is "eighteen million, four hundred sixty-nine thousand, four hundred forty".