18904338 has 12 divisors (see below), whose sum is σ = 40959438. Its totient is φ = 6301440.

The previous prime is 18904313. The next prime is 18904349. The reversal of 18904338 is 83340981.

It can be written as a sum of positive squares in only one way, i.e., 17918289 + 986049 = 4233^2 + 993^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 525103 + ... + 525138.

Almost surely, 2^18904338 is an apocalyptic number.

18904338 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18904338 is an abundant number, since it is smaller than the sum of its proper divisors (22055100).

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

18904338 is a wasteful number, since it uses less digits than its factorization.

18904338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1050249 (or 1050246 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 18904338 is about 4347.9119126312. The cubic root of 18904338 is about 266.3915784747.

The spelling of 18904338 in words is "eighteen million, nine hundred four thousand, three hundred thirty-eight".