18422977 has 4 divisors (see below), whose sum is σ = 19224000. Its totient is φ = 17621956.

The previous prime is 18422969. The next prime is 18422983. The reversal of 18422977 is 77922481.

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 not a de Polignac number, because 18422977 - 2³ = 18422969 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18422777) 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, 400477 + ... + 400522.

It is an arithmetic number, because the mean of its divisors is an integer number (4806000).

Almost surely, 2^18422977 is an apocalyptic number.

It is an amenable number.

18422977 is a deficient number, since it is larger than the sum of its proper divisors (801023).

18422977 is an equidigital number, since it uses as much as digits as its factorization.

18422977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 801022.

The product of its digits is 56448, while the sum is 40.

The square root of 18422977 is about 4292.1995526769. The cubic root of 18422977 is about 264.1110691586. Note that the first 3 decimals are identical.

The spelling of 18422977 in words is "eighteen million, four hundred twenty-two thousand, nine hundred seventy-seven".