399291497412 has 12 divisors (see below), whose sum is σ = 931680160656. Its totient is φ = 133097165800.

The previous prime is 399291497387. The next prime is 399291497413. The reversal of 399291497412 is 214794192993.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (399291497413) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16637145714 + ... + 16637145737.

It is an arithmetic number, because the mean of its divisors is an integer number (77640013388).

Almost surely, 2^399291497412 is an apocalyptic number.

It is an amenable number.

399291497412 is an abundant number, since it is smaller than the sum of its proper divisors (532388663244).

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

399291497412 is a wasteful number, since it uses less digits than its factorization.

399291497412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33274291458 (or 33274291456 counting only the distinct ones).

The product of its digits is 8817984, while the sum is 60.

The spelling of 399291497412 in words is "three hundred ninety-nine billion, two hundred ninety-one million, four hundred ninety-seven thousand, four hundred twelve".