399240056623 has 2 divisors, whose sum is σ = 399240056624. Its totient is φ = 399240056622.

The previous prime is 399240056561. The next prime is 399240056647. The reversal of 399240056623 is 326650042993.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-399240056623 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (399240056693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199620028311 + 199620028312.

It is an arithmetic number, because the mean of its divisors is an integer number (199620028312).

Almost surely, 2^399240056623 is an apocalyptic number.

399240056623 is a deficient number, since it is larger than the sum of its proper divisors (1).

399240056623 is an equidigital number, since it uses as much as digits as its factorization.

399240056623 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2099520, while the sum is 49.

The spelling of 399240056623 in words is "three hundred ninety-nine billion, two hundred forty million, fifty-six thousand, six hundred twenty-three".