399402740447 has 2 divisors, whose sum is σ = 399402740448. Its totient is φ = 399402740446.

The previous prime is 399402740437. The next prime is 399402740521. The reversal of 399402740447 is 744047204993.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 399402740447 - 2⁴ = 399402740431 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (399402740437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199701370223 + 199701370224.

It is an arithmetic number, because the mean of its divisors is an integer number (199701370224).

Almost surely, 2^399402740447 is an apocalyptic number.

399402740447 is a deficient number, since it is larger than the sum of its proper divisors (1).

399402740447 is an equidigital number, since it uses as much as digits as its factorization.

399402740447 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6096384, while the sum is 53.

The spelling of 399402740447 in words is "three hundred ninety-nine billion, four hundred two million, seven hundred forty thousand, four hundred forty-seven".