18805977 has 12 divisors (see below), whose sum is σ = 27234480. Its totient is φ = 12504888.

The previous prime is 18805951. The next prime is 18806077. The reversal of 18805977 is 77950881.

It is not a de Polignac number, because 18805977 - 2⁷ = 18805849 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (18805907) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1278 + ... + 6264.

It is an arithmetic number, because the mean of its divisors is an integer number (2269540).

Almost surely, 2^18805977 is an apocalyptic number.

It is an amenable number.

18805977 is a deficient number, since it is larger than the sum of its proper divisors (8428503).

18805977 is a wasteful number, since it uses less digits than its factorization.

18805977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5412 (or 5409 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 45.

The square root of 18805977 is about 4336.5858690910. The cubic root of 18805977 is about 265.9287549222.

The spelling of 18805977 in words is "eighteen million, eight hundred five thousand, nine hundred seventy-seven".