18469890 has 64 divisors (see below), whose sum is σ = 50037120. Its totient is φ = 4847040.

The previous prime is 18469889. The next prime is 18469921. The reversal of 18469890 is 9896481.

It is a super-2 number, since 2×18469890² = 682273673224200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17580 + ... + 18600.

It is an arithmetic number, because the mean of its divisors is an integer number (781830).

Almost surely, 2^18469890 is an apocalyptic number.

18469890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18469890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25018560).

18469890 is an abundant number, since it is smaller than the sum of its proper divisors (31567230).

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

18469890 is a wasteful number, since it uses less digits than its factorization.

18469890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1104 (or 1098 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The square root of 18469890 is about 4297.6609917489. The cubic root of 18469890 is about 264.3350601100.

The spelling of 18469890 in words is "eighteen million, four hundred sixty-nine thousand, eight hundred ninety".