18374640 has 40 divisors (see below), whose sum is σ = 56962128. Its totient is φ = 4899840.

The previous prime is 18374639. The next prime is 18374651. The reversal of 18374640 is 4647381.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38041 + ... + 38520.

Almost surely, 2^18374640 is an apocalyptic number.

18374640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18374640 is an abundant number, since it is smaller than the sum of its proper divisors (38587488).

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

18374640 is a wasteful number, since it uses less digits than its factorization.

18374640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76577 (or 76571 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 18374640 is about 4286.5650584122. The cubic root of 18374640 is about 263.8798810755.

The spelling of 18374640 in words is "eighteen million, three hundred seventy-four thousand, six hundred forty".