18977963 has 2 divisors, whose sum is σ = 18977964. Its totient is φ = 18977962.

The previous prime is 18977939. The next prime is 18978019. The reversal of 18977963 is 36977981.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18977963 - 2¹⁰ = 18976939 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18977863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9488981 + 9488982.

It is an arithmetic number, because the mean of its divisors is an integer number (9488982).

Almost surely, 2^18977963 is an apocalyptic number.

18977963 is a deficient number, since it is larger than the sum of its proper divisors (1).

18977963 is an equidigital number, since it uses as much as digits as its factorization.

18977963 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 571536, while the sum is 50.

The square root of 18977963 is about 4356.3703928844. The cubic root of 18977963 is about 266.7369608089.

The spelling of 18977963 in words is "eighteen million, nine hundred seventy-seven thousand, nine hundred sixty-three".