77434397 has 2 divisors, whose sum is σ = 77434398. Its totient is φ = 77434396.

The previous prime is 77434391. The next prime is 77434411. The reversal of 77434397 is 79343477.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72914521 + 4519876 = 8539^2 + 2126^2 .

It is a cyclic number.

It is not a de Polignac number, because 77434397 - 2⁴ = 77434381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77434391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38717198 + 38717199.

It is an arithmetic number, because the mean of its divisors is an integer number (38717199).

Almost surely, 2^77434397 is an apocalyptic number.

It is an amenable number.

77434397 is a deficient number, since it is larger than the sum of its proper divisors (1).

77434397 is an equidigital number, since it uses as much as digits as its factorization.

77434397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 444528, while the sum is 44.

The square root of 77434397 is about 8799.6816419686. The cubic root of 77434397 is about 426.2306145528.

The spelling of 77434397 in words is "seventy-seven million, four hundred thirty-four thousand, three hundred ninety-seven".