399976812 has 96 divisors (see below), whose sum is σ = 1080979200. Its totient is φ = 127785600.

The previous prime is 399976747. The next prime is 399976813. The reversal of 399976812 is 218679993.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (399976813) 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 31 ways as a sum of consecutive naturals, for example, 260487 + ... + 262017.

It is an arithmetic number, because the mean of its divisors is an integer number (11260200).

Almost surely, 2^399976812 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 399976812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (540489600).

399976812 is an abundant number, since it is smaller than the sum of its proper divisors (681002388).

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

399976812 is a wasteful number, since it uses less digits than its factorization.

399976812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1644 (or 1636 counting only the distinct ones).

The product of its digits is 1469664, while the sum is 54.

The square root of 399976812 is about 19999.4202915985. The cubic root of 399976812 is about 736.7920618992.

The spelling of 399976812 in words is "three hundred ninety-nine million, nine hundred seventy-six thousand, eight hundred twelve".