18152440 has 32 divisors (see below), whose sum is σ = 41310000. Its totient is φ = 7177984.

The previous prime is 18152437. The next prime is 18152461. The reversal of 18152440 is 4425181.

It is a super-2 number, since 2×18152440² = 659022155907200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1011 + ... + 6109.

Almost surely, 2^18152440 is an apocalyptic number.

18152440 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 18152440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20655000).

18152440 is an abundant number, since it is smaller than the sum of its proper divisors (23157560).

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

18152440 is a wasteful number, since it uses less digits than its factorization.

18152440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5199 (or 5195 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 25.

The square root of 18152440 is about 4260.5680372457. The cubic root of 18152440 is about 262.8118862809.

The spelling of 18152440 in words is "eighteen million, one hundred fifty-two thousand, four hundred forty".