399881100 has 72 divisors (see below), whose sum is σ = 1160772928. Its totient is φ = 106286400.

The previous prime is 399881099. The next prime is 399881101. The reversal of 399881100 is 1188993.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (399881099) and next prime (399881101).

It is not an unprimeable number, because it can be changed into a prime (399881101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 97287 + ... + 101313.

Almost surely, 2^399881100 is an apocalyptic number.

399881100 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 399881100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (580386464).

399881100 is an abundant number, since it is smaller than the sum of its proper divisors (760891828).

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

399881100 is a wasteful number, since it uses less digits than its factorization.

399881100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4375 (or 4368 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 39.

The square root of 399881100 is about 19997.0272790733. The cubic root of 399881100 is about 736.7332872691.

The spelling of 399881100 in words is "three hundred ninety-nine million, eight hundred eighty-one thousand, one hundred".