18349740 has 120 divisors (see below), whose sum is σ = 59032512. Its totient is φ = 4769280.

The previous prime is 18349739. The next prime is 18349741. The reversal of 18349740 is 4794381.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18349739) and next prime (18349741).

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 = 18349695 and 18349704.

It is not an unprimeable number, because it can be changed into a prime (18349741) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 76020 + ... + 76260.

Almost surely, 2^18349740 is an apocalyptic number.

18349740 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 18349740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29516256).

18349740 is an abundant number, since it is smaller than the sum of its proper divisors (40682772).

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

18349740 is a wasteful number, since it uses less digits than its factorization.

18349740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309 (or 298 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 18349740 is about 4283.6596503457. The cubic root of 18349740 is about 263.7606301354.

It can be divided in two parts, 1 and 8349740, that added together give a triangular number (8349741 = T₄₀₈₆).

The spelling of 18349740 in words is "eighteen million, three hundred forty-nine thousand, seven hundred forty".