18554939 has 16 divisors (see below), whose sum is σ = 21373632. Its totient is φ = 15955968.

The previous prime is 18554933. The next prime is 18554941. The reversal of 18554939 is 93945581.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 18554939 - 2⁴ = 18554923 is a prime.

It is a super-2 number, since 2×18554939² = 688571522587442, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18554939.

It is not an unprimeable number, because it can be changed into a prime (18554933) 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 15 ways as a sum of consecutive naturals, for example, 24602 + ... + 25344.

It is an arithmetic number, because the mean of its divisors is an integer number (1335852).

Almost surely, 2^18554939 is an apocalyptic number.

18554939 is a deficient number, since it is larger than the sum of its proper divisors (2818693).

18554939 is a wasteful number, since it uses less digits than its factorization.

18554939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 886.

The product of its digits is 194400, while the sum is 44.

The square root of 18554939 is about 4307.5444280936. The cubic root of 18554939 is about 264.7401701477.

The spelling of 18554939 in words is "eighteen million, five hundred fifty-four thousand, nine hundred thirty-nine".