399662026872 has 128 divisors (see below), whose sum is σ = 1062779304960. Its totient is φ = 124980387840.

The previous prime is 399662026867. The next prime is 399662026889. The reversal of 399662026872 is 278620266993.

It is a happy number.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7537638 + ... + 7590474.

It is an arithmetic number, because the mean of its divisors is an integer number (8302963320).

Almost surely, 2^399662026872 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 399662026872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (531389652480).

399662026872 is an abundant number, since it is smaller than the sum of its proper divisors (663117278088).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

399662026872 is a wasteful number, since it uses less digits than its factorization.

399662026872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53133 (or 53129 counting only the distinct ones).

The product of its (nonzero) digits is 23514624, while the sum is 60.

The spelling of 399662026872 in words is "three hundred ninety-nine billion, six hundred sixty-two million, twenty-six thousand, eight hundred seventy-two".