399240056751 has 32 divisors (see below), whose sum is σ = 560734783488. Its totient is φ = 252179447520.

The previous prime is 399240056731. The next prime is 399240056767. The reversal of 399240056751 is 157650042993.

It is not a de Polignac number, because 399240056751 - 2⁷ = 399240056623 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 399240056694 and 399240056703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399240056731) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4903960 + ... + 4984706.

It is an arithmetic number, because the mean of its divisors is an integer number (17522961984).

Almost surely, 2^399240056751 is an apocalyptic number.

399240056751 is a deficient number, since it is larger than the sum of its proper divisors (161494726737).

399240056751 is a wasteful number, since it uses less digits than its factorization.

399240056751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81451.

The product of its (nonzero) digits is 2041200, while the sum is 51.

The spelling of 399240056751 in words is "three hundred ninety-nine billion, two hundred forty million, fifty-six thousand, seven hundred fifty-one".