18461977 has 4 divisors (see below), whose sum is σ = 19433680. Its totient is φ = 17490276.

The previous prime is 18461969. The next prime is 18461987. The reversal of 18461977 is 77916481.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18461977 - 2³ = 18461969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18461987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 485823 + ... + 485860.

It is an arithmetic number, because the mean of its divisors is an integer number (4858420).

Almost surely, 2^18461977 is an apocalyptic number.

It is an amenable number.

18461977 is a deficient number, since it is larger than the sum of its proper divisors (971703).

18461977 is an equidigital number, since it uses as much as digits as its factorization.

18461977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 971702.

The product of its digits is 84672, while the sum is 43.

The square root of 18461977 is about 4296.7402760698. The cubic root of 18461977 is about 264.2973052901.

The spelling of 18461977 in words is "eighteen million, four hundred sixty-one thousand, nine hundred seventy-seven".