399279906780 has 48 divisors (see below), whose sum is σ = 1183747491360. Its totient is φ = 100211427328.

The previous prime is 399279906737. The next prime is 399279906871. The reversal of 399279906780 is 87609972993.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 195724425 + ... + 195726464.

It is an arithmetic number, because the mean of its divisors is an integer number (24661406070).

Almost surely, 2^399279906780 is an apocalyptic number.

399279906780 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

399279906780 is an abundant number, since it is smaller than the sum of its proper divisors (784467584580).

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

399279906780 is a wasteful number, since it uses less digits than its factorization.

399279906780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391450918 (or 391450916 counting only the distinct ones).

The product of its (nonzero) digits is 92588832, while the sum is 69.

The spelling of 399279906780 in words is "three hundred ninety-nine billion, two hundred seventy-nine million, nine hundred six thousand, seven hundred eighty".