18996440 has 16 divisors (see below), whose sum is σ = 42742080. Its totient is φ = 7598560.

The previous prime is 18996403. The next prime is 18996451. The reversal of 18996440 is 4469981.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 237416 + ... + 237495.

It is an arithmetic number, because the mean of its divisors is an integer number (2671380).

Almost surely, 2^18996440 is an apocalyptic number.

18996440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18996440 is an abundant number, since it is smaller than the sum of its proper divisors (23745640).

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

18996440 is a wasteful number, since it uses less digits than its factorization.

18996440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474922 (or 474918 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 18996440 is about 4358.4905644041. The cubic root of 18996440 is about 266.8234980244.

The spelling of 18996440 in words is "eighteen million, nine hundred ninety-six thousand, four hundred forty".