399689472 has 432 divisors, whose sum is σ = 1435378560. Its totient is φ = 97542144.

The previous prime is 399689471. The next prime is 399689497. The reversal of 399689472 is 274986993.

It is a Harshad number since it is a multiple of its sum of digits (57).

Its product of digits (5878656) is a multiple of the sum of its prime factors (108).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399689471) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 9295083 + ... + 9295125.

Almost surely, 2^399689472 is an apocalyptic number.

399689472 is a gapful number since it is divisible by the number (32) 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 399689472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (717689280).

399689472 is an abundant number, since it is smaller than the sum of its proper divisors (1035689088).

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

399689472 is a wasteful number, since it uses less digits than its factorization.

399689472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108 (or 87 counting only the distinct ones).

The product of its digits is 5878656, while the sum is 57.

The square root of 399689472 is about 19992.2352927330. The cubic root of 399689472 is about 736.6155845454.

The spelling of 399689472 in words is "three hundred ninety-nine million, six hundred eighty-nine thousand, four hundred seventy-two".