18964977 has 8 divisors (see below), whose sum is σ = 25607040. Its totient is φ = 12483120.

The previous prime is 18964973. The next prime is 18964987. The reversal of 18964977 is 77946981.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18964977 - 2² = 18964973 is a prime.

It is a super-2 number, since 2×18964977² = 719340705221058, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18964973) 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 7 ways as a sum of consecutive naturals, for example, 39774 + ... + 40247.

It is an arithmetic number, because the mean of its divisors is an integer number (3200880).

Almost surely, 2^18964977 is an apocalyptic number.

It is an amenable number.

18964977 is a deficient number, since it is larger than the sum of its proper divisors (6642063).

18964977 is an equidigital number, since it uses as much as digits as its factorization.

18964977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80103.

The product of its digits is 762048, while the sum is 51.

The square root of 18964977 is about 4354.8796768682. The cubic root of 18964977 is about 266.6761071311.

The spelling of 18964977 in words is "eighteen million, nine hundred sixty-four thousand, nine hundred seventy-seven".