399931907747 has 2 divisors, whose sum is σ = 399931907748. Its totient is φ = 399931907746.

The previous prime is 399931907743. The next prime is 399931907761. The reversal of 399931907747 is 747709139993.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 399931907747 - 2² = 399931907743 is a prime.

It is not a weakly prime, because it can be changed into another prime (399931907743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199965953873 + 199965953874.

It is an arithmetic number, because the mean of its divisors is an integer number (199965953874).

Almost surely, 2^399931907747 is an apocalyptic number.

399931907747 is a deficient number, since it is larger than the sum of its proper divisors (1).

399931907747 is an equidigital number, since it uses as much as digits as its factorization.

399931907747 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81015228, while the sum is 68.

The spelling of 399931907747 in words is "three hundred ninety-nine billion, nine hundred thirty-one million, nine hundred seven thousand, seven hundred forty-seven".