399050429940 has 72 divisors (see below), whose sum is σ = 1211448256200. Its totient is φ = 106325950464.

The previous prime is 399050429909. The next prime is 399050429941. The reversal of 399050429940 is 49924050993.

399050429940 is a `hidden beast` number, since 3 + 9 + 9 + 0 + 504 + 2 + 99 + 40 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1197298404 + 397853131536 = 34602^2 + 630756^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399050429941) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 691765 + ... + 1129884.

It is an arithmetic number, because the mean of its divisors is an integer number (16825670225).

Almost surely, 2^399050429940 is an apocalyptic number.

399050429940 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

399050429940 is an abundant number, since it is smaller than the sum of its proper divisors (812397826260).

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

399050429940 is a wasteful number, since it uses less digits than its factorization.

399050429940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1822881 (or 1822876 counting only the distinct ones).

The product of its (nonzero) digits is 3149280, while the sum is 54.

The spelling of 399050429940 in words is "three hundred ninety-nine billion, fifty million, four hundred twenty-nine thousand, nine hundred forty".