18957290 has 64 divisors (see below), whose sum is σ = 39813120. Its totient is φ = 6431040.

The previous prime is 18957259. The next prime is 18957311. The reversal of 18957290 is 9275981.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 149207 + ... + 149333.

It is an arithmetic number, because the mean of its divisors is an integer number (622080).

Almost surely, 2^18957290 is an apocalyptic number.

18957290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18957290 is an abundant number, since it is smaller than the sum of its proper divisors (20855830).

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

18957290 is a wasteful number, since it uses less digits than its factorization.

18957290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227.

The product of its (nonzero) digits is 45360, while the sum is 41.

The square root of 18957290 is about 4353.9970142388. The cubic root of 18957290 is about 266.6400720006.

The spelling of 18957290 in words is "eighteen million, nine hundred fifty-seven thousand, two hundred ninety".