18616440 has 32 divisors (see below), whose sum is σ = 55849680. Its totient is φ = 4964352.

The previous prime is 18616417. The next prime is 18616441. The reversal of 18616440 is 4461681.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 18616398 and 18616407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18616441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77449 + ... + 77688.

Almost surely, 2^18616440 is an apocalyptic number.

18616440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18616440 is an abundant number, since it is smaller than the sum of its proper divisors (37233240).

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

18616440 is a wasteful number, since it uses less digits than its factorization.

18616440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155151 (or 155147 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 18616440 is about 4314.6772764600. The cubic root of 18616440 is about 265.0323444560.

The spelling of 18616440 in words is "eighteen million, six hundred sixteen thousand, four hundred forty".