399057221040 has 160 divisors (see below), whose sum is σ = 1256265593856. Its totient is φ = 104768885760.

The previous prime is 399057221039. The next prime is 399057221051. The reversal of 399057221040 is 40122750993.

It is a junction number, because it is equal to n+sod(n) for n = 399057220983 and 399057221001.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12371974 + ... + 12404186.

Almost surely, 2^399057221040 is an apocalyptic number.

399057221040 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 399057221040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (628132796928).

399057221040 is an abundant number, since it is smaller than the sum of its proper divisors (857208372816).

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

399057221040 is a wasteful number, since it uses less digits than its factorization.

399057221040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33027 (or 33021 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 42.

The spelling of 399057221040 in words is "three hundred ninety-nine billion, fifty-seven million, two hundred twenty-one thousand, forty".