18704457 has 12 divisors (see below), whose sum is σ = 27421680. Its totient is φ = 12283128.

The previous prime is 18704447. The next prime is 18704459. The reversal of 18704457 is 75440781.

It is not a de Polignac number, because 18704457 - 2⁶ = 18704393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18704459) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 14907 + ... + 16112.

It is an arithmetic number, because the mean of its divisors is an integer number (2285140).

Almost surely, 2^18704457 is an apocalyptic number.

It is an amenable number.

18704457 is a deficient number, since it is larger than the sum of its proper divisors (8717223).

18704457 is a wasteful number, since it uses less digits than its factorization.

18704457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31092 (or 31089 counting only the distinct ones).

The product of its (nonzero) digits is 31360, while the sum is 36.

The square root of 18704457 is about 4324.8649689904. The cubic root of 18704457 is about 265.4493716437.

The spelling of 18704457 in words is "eighteen million, seven hundred four thousand, four hundred fifty-seven".