399086977 has 2 divisors, whose sum is σ = 399086978. Its totient is φ = 399086976.

The previous prime is 399086971. The next prime is 399087037. The reversal of 399086977 is 779680993.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 244109376 + 154977601 = 15624^2 + 12449^2 .

It is a cyclic number.

It is not a de Polignac number, because 399086977 - 2³ = 399086969 is a prime.

It is not a weakly prime, because it can be changed into another prime (399086971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199543488 + 199543489.

It is an arithmetic number, because the mean of its divisors is an integer number (199543489).

Almost surely, 2^399086977 is an apocalyptic number.

It is an amenable number.

399086977 is a deficient number, since it is larger than the sum of its proper divisors (1).

399086977 is an equidigital number, since it uses as much as digits as its factorization.

399086977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5143824, while the sum is 58.

The square root of 399086977 is about 19977.1613849416. The cubic root of 399086977 is about 736.2452717366.

The spelling of 399086977 in words is "three hundred ninety-nine million, eighty-six thousand, nine hundred seventy-seven".