18487964 has 24 divisors (see below), whose sum is σ = 36514800. Its totient is φ = 8113280.

The previous prime is 18487951. The next prime is 18488011. The reversal of 18487964 is 46978481.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 5969 + ... + 8520.

It is an arithmetic number, because the mean of its divisors is an integer number (1521450).

Almost surely, 2^18487964 is an apocalyptic number.

It is an amenable number.

18487964 is a deficient number, since it is larger than the sum of its proper divisors (18026836).

18487964 is a wasteful number, since it uses less digits than its factorization.

18487964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14533 (or 14531 counting only the distinct ones).

The product of its digits is 387072, while the sum is 47.

The square root of 18487964 is about 4299.7632492964. The cubic root of 18487964 is about 264.4212550707.

The spelling of 18487964 in words is "eighteen million, four hundred eighty-seven thousand, nine hundred sixty-four".