18486939 has 32 divisors (see below), whose sum is σ = 27349056. Its totient is φ = 11059200.

The previous prime is 18486931. The next prime is 18486961. The reversal of 18486939 is 93968481.

It is not a de Polignac number, because 18486939 - 2³ = 18486931 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18486931) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 182989 + ... + 183089.

It is an arithmetic number, because the mean of its divisors is an integer number (854658).

Almost surely, 2^18486939 is an apocalyptic number.

18486939 is a deficient number, since it is larger than the sum of its proper divisors (8862117).

18486939 is a wasteful number, since it uses less digits than its factorization.

18486939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255.

The product of its digits is 373248, while the sum is 48.

The square root of 18486939 is about 4299.6440550353. The cubic root of 18486939 is about 264.4163683456.

The spelling of 18486939 in words is "eighteen million, four hundred eighty-six thousand, nine hundred thirty-nine".