18864956 has 24 divisors (see below), whose sum is σ = 36360576. Its totient is φ = 8492720.

The previous prime is 18864887. The next prime is 18864959. The reversal of 18864956 is 65946881.

It is a self number, because there is not a number n which added to its sum of digits gives 18864956.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18864959) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2705 + ... + 6711.

It is an arithmetic number, because the mean of its divisors is an integer number (1515024).

Almost surely, 2^18864956 is an apocalyptic number.

It is an amenable number.

18864956 is a deficient number, since it is larger than the sum of its proper divisors (17495620).

18864956 is a wasteful number, since it uses less digits than its factorization.

18864956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4129 (or 4127 counting only the distinct ones).

The product of its digits is 414720, while the sum is 47.

The square root of 18864956 is about 4343.3807109209. The cubic root of 18864956 is about 266.2064652897.

The spelling of 18864956 in words is "eighteen million, eight hundred sixty-four thousand, nine hundred fifty-six".