18419977 has 4 divisors (see below), whose sum is σ = 18732240. Its totient is φ = 18107716.

The previous prime is 18419963. The next prime is 18419981. The reversal of 18419977 is 77991481.

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 18419977 - 2¹⁵ = 18387209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18419917) 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, 156043 + ... + 156160.

It is an arithmetic number, because the mean of its divisors is an integer number (4683060).

Almost surely, 2^18419977 is an apocalyptic number.

It is an amenable number.

18419977 is a deficient number, since it is larger than the sum of its proper divisors (312263).

18419977 is an equidigital number, since it uses as much as digits as its factorization.

18419977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312262.

The product of its digits is 127008, while the sum is 46.

The square root of 18419977 is about 4291.8500672787. The cubic root of 18419977 is about 264.0967324200.

The spelling of 18419977 in words is "eighteen million, four hundred nineteen thousand, nine hundred seventy-seven".