399901860 has 120 divisors (see below), whose sum is σ = 1295137536. Its totient is φ = 103187520.

The previous prime is 399901813. The next prime is 399901903. The reversal of 399901860 is 68109993.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 46239 + ... + 54201.

Almost surely, 2^399901860 is an apocalyptic number.

399901860 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 399901860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (647568768).

399901860 is an abundant number, since it is smaller than the sum of its proper divisors (895235676).

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

399901860 is a wasteful number, since it uses less digits than its factorization.

399901860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8015 (or 8004 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 45.

The square root of 399901860 is about 19997.5463494900. The cubic root of 399901860 is about 736.7460363241.

The spelling of 399901860 in words is "three hundred ninety-nine million, nine hundred one thousand, eight hundred sixty".