77977423 has 2 divisors, whose sum is σ = 77977424. Its totient is φ = 77977422.

The previous prime is 77977399. The next prime is 77977513. The reversal of 77977423 is 32477977.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 77977423 - 2⁵ = 77977391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77977223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38988711 + 38988712.

It is an arithmetic number, because the mean of its divisors is an integer number (38988712).

Almost surely, 2^77977423 is an apocalyptic number.

77977423 is a deficient number, since it is larger than the sum of its proper divisors (1).

77977423 is an equidigital number, since it uses as much as digits as its factorization.

77977423 is an evil number, because the sum of its binary digits is even.

The product of its digits is 518616, while the sum is 46.

The square root of 77977423 is about 8830.4826028932. The cubic root of 77977423 is about 427.2246403392.

It can be divided in two parts, 77977 and 423, that added together give a square (78400 = 280²).

The spelling of 77977423 in words is "seventy-seven million, nine hundred seventy-seven thousand, four hundred twenty-three".