18490816 has 28 divisors (see below), whose sum is σ = 36850320. Its totient is φ = 9205760.

The previous prime is 18490807. The next prime is 18490841. The reversal of 18490816 is 61809481.

It is a happy number.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

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, 19440 + ... + 20368.

Almost surely, 2^18490816 is an apocalyptic number.

18490816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18490816 is a deficient number, since it is larger than the sum of its proper divisors (18359504).

18490816 is an equidigital number, since it uses as much as digits as its factorization.

18490816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1252 (or 1242 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 37.

The square root of 18490816 is about 4300.0948826741. The cubic root of 18490816 is about 264.4348511351.

It can be divided in two parts, 184908 and 16, that multiplied together give a triangular number (2958528 = T₂₄₃₂).

The spelling of 18490816 in words is "eighteen million, four hundred ninety thousand, eight hundred sixteen".