399246901877 has 2 divisors, whose sum is σ = 399246901878. Its totient is φ = 399246901876.

The previous prime is 399246901849. The next prime is 399246901967. The reversal of 399246901877 is 778109642993.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 394441778116 + 4805123761 = 628046^2 + 69319^2 .

It is a cyclic number.

It is not a de Polignac number, because 399246901877 - 2¹⁴ = 399246885493 is a prime.

It is a super-2 number, since 2×399246901877² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (399246901847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199623450938 + 199623450939.

It is an arithmetic number, because the mean of its divisors is an integer number (199623450939).

Almost surely, 2^399246901877 is an apocalyptic number.

It is an amenable number.

399246901877 is a deficient number, since it is larger than the sum of its proper divisors (1).

399246901877 is an equidigital number, since it uses as much as digits as its factorization.

399246901877 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41150592, while the sum is 65.

The spelling of 399246901877 in words is "three hundred ninety-nine billion, two hundred forty-six million, nine hundred one thousand, eight hundred seventy-seven".