399966155704 has 32 divisors (see below), whose sum is σ = 752287208400. Its totient is φ = 199356433920.

The previous prime is 399966155639. The next prime is 399966155707. The reversal of 399966155704 is 407551669993.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399966155707) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27651034 + ... + 27665494.

Almost surely, 2^399966155704 is an apocalyptic number.

It is an amenable number.

399966155704 is a deficient number, since it is larger than the sum of its proper divisors (352321052696).

399966155704 is a wasteful number, since it uses less digits than its factorization.

399966155704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25063 (or 25059 counting only the distinct ones).

The product of its (nonzero) digits is 55112400, while the sum is 64.

The spelling of 399966155704 in words is "three hundred ninety-nine billion, nine hundred sixty-six million, one hundred fifty-five thousand, seven hundred four".