18456939 has 6 divisors (see below), whose sum is σ = 26660036. Its totient is φ = 12304620.

The previous prime is 18456937. The next prime is 18456941. The reversal of 18456939 is 93965481.

It is a happy number.

18456939 is a `hidden beast` number, since 1 + 84 + 569 + 3 + 9 = 666.

It is an interprime number because it is at equal distance from previous prime (18456937) and next prime (18456941).

It is not a de Polignac number, because 18456939 - 2¹ = 18456937 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18456894 and 18456903.

It is not an unprimeable number, because it can be changed into a prime (18456937) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1025377 + ... + 1025394.

Almost surely, 2^18456939 is an apocalyptic number.

18456939 is a deficient number, since it is larger than the sum of its proper divisors (8203097).

18456939 is a wasteful number, since it uses less digits than its factorization.

18456939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2050777 (or 2050774 counting only the distinct ones).

The product of its digits is 233280, while the sum is 45.

The square root of 18456939 is about 4296.1539776875. The cubic root of 18456939 is about 264.2732621633.

The spelling of 18456939 in words is "eighteen million, four hundred fifty-six thousand, nine hundred thirty-nine".