399957377 has 2 divisors, whose sum is σ = 399957378. Its totient is φ = 399957376.

The previous prime is 399957301. The next prime is 399957403. The reversal of 399957377 is 773759993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 253159921 + 146797456 = 15911^2 + 12116^2 .

It is an emirp because it is prime and its reverse (773759993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 399957377 - 2⁸ = 399957121 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (399957977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199978688 + 199978689.

It is an arithmetic number, because the mean of its divisors is an integer number (199978689).

Almost surely, 2^399957377 is an apocalyptic number.

It is an amenable number.

399957377 is a deficient number, since it is larger than the sum of its proper divisors (1).

399957377 is an equidigital number, since it uses as much as digits as its factorization.

399957377 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11252115, while the sum is 59.

The square root of 399957377 is about 19998.9343966122. The cubic root of 399957377 is about 736.7801280527.

The spelling of 399957377 in words is "three hundred ninety-nine million, nine hundred fifty-seven thousand, three hundred seventy-seven".