77974493 has 2 divisors, whose sum is σ = 77974494. Its totient is φ = 77974492.

The previous prime is 77974487. The next prime is 77974541. The reversal of 77974493 is 39447977.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77915929 + 58564 = 8827^2 + 242^2 .

It is a cyclic number.

It is not a de Polignac number, because 77974493 - 2²⁴ = 61197277 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77974483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38987246 + 38987247.

It is an arithmetic number, because the mean of its divisors is an integer number (38987247).

Almost surely, 2^77974493 is an apocalyptic number.

It is an amenable number.

77974493 is a deficient number, since it is larger than the sum of its proper divisors (1).

77974493 is an equidigital number, since it uses as much as digits as its factorization.

77974493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1333584, while the sum is 50.

The square root of 77974493 is about 8830.3166987374. The cubic root of 77974493 is about 427.2192892866.

The spelling of 77974493 in words is "seventy-seven million, nine hundred seventy-four thousand, four hundred ninety-three".