399677 has 2 divisors, whose sum is σ = 399678. Its totient is φ = 399676.

The previous prime is 399667. The next prime is 399689. The reversal of 399677 is 776993.

399677 = 364² + 365² + 366².

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 256036 + 143641 = 506^2 + 379^2 .

It is a cyclic number.

It is not a de Polignac number, because 399677 - 2⁶ = 399613 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (399617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199838 + 199839.

It is an arithmetic number, because the mean of its divisors is an integer number (199839).

2³⁹⁹⁶⁷⁷ is an apocalyptic number.

It is an amenable number.

399677 is a deficient number, since it is larger than the sum of its proper divisors (1).

399677 is an equidigital number, since it uses as much as digits as its factorization.

399677 is an evil number, because the sum of its binary digits is even.

The product of its digits is 71442, while the sum is 41.

The square root of 399677 is about 632.2001265422. The cubic root of 399677 is about 73.6607922626.

The spelling of 399677 in words is "three hundred ninety-nine thousand, six hundred seventy-seven".