18977422 has 4 divisors (see below), whose sum is σ = 28466136. Its totient is φ = 9488710.

The previous prime is 18977419. The next prime is 18977429. The reversal of 18977422 is 22477981.

It is a semiprime because it is the product of two primes.

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 congruent number.

It is not an unprimeable number, because it can be changed into a prime (18977429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4744354 + ... + 4744357.

It is an arithmetic number, because the mean of its divisors is an integer number (7116534).

Almost surely, 2^18977422 is an apocalyptic number.

18977422 is a deficient number, since it is larger than the sum of its proper divisors (9488714).

18977422 is an equidigital number, since it uses as much as digits as its factorization.

18977422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9488713.

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

The square root of 18977422 is about 4356.3082994664. The cubic root of 18977422 is about 266.7344261837.

The spelling of 18977422 in words is "eighteen million, nine hundred seventy-seven thousand, four hundred twenty-two".