399298978990 has 16 divisors (see below), whose sum is σ = 743522237280. Its totient is φ = 154212019360.

The previous prime is 399298978907. The next prime is 399298979017. The reversal of 399298978990 is 99879892993.

It is a super-2 number, since 2×399298978990² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 688446226 + ... + 688446805.

It is an arithmetic number, because the mean of its divisors is an integer number (46470139830).

Almost surely, 2^399298978990 is an apocalyptic number.

399298978990 is a deficient number, since it is larger than the sum of its proper divisors (344223258290).

399298978990 is a wasteful number, since it uses less digits than its factorization.

399298978990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1376893067.

The product of its (nonzero) digits is 1428513408, while the sum is 82.

The spelling of 399298978990 in words is "three hundred ninety-nine billion, two hundred ninety-eight million, nine hundred seventy-eight thousand, nine hundred ninety".