399494400 has 108 divisors (see below), whose sum is σ = 1318478112. Its totient is φ = 106526720.

The previous prime is 399494387. The next prime is 399494411. The reversal of 399494400 is 4494993.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8797 + ... + 29603.

Almost surely, 2^399494400 is an apocalyptic number.

399494400 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 399494400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (659239056).

399494400 is an abundant number, since it is smaller than the sum of its proper divisors (918983712).

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

399494400 is a wasteful number, since it uses less digits than its factorization.

399494400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20836 (or 20817 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 42.

The square root of 399494400 is about 19987.3560032336. The cubic root of 399494400 is about 736.4957277827.

The spelling of 399494400 in words is "three hundred ninety-nine million, four hundred ninety-four thousand, four hundred".