18812938 has 8 divisors (see below), whose sum is σ = 29192580. Its totient is φ = 9082080.

The previous prime is 18812929. The next prime is 18812951. The reversal of 18812938 is 83921881.

It can be written as a sum of positive squares in 2 ways, for example, as 18688329 + 124609 = 4323^2 + 353^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 18812938.

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, 162123 + ... + 162238.

Almost surely, 2^18812938 is an apocalyptic number.

18812938 is a deficient number, since it is larger than the sum of its proper divisors (10379642).

18812938 is a wasteful number, since it uses less digits than its factorization.

18812938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324392.

The product of its digits is 27648, while the sum is 40.

The square root of 18812938 is about 4337.3883847311. The cubic root of 18812938 is about 265.9615618983.

The spelling of 18812938 in words is "eighteen million, eight hundred twelve thousand, nine hundred thirty-eight".