399089280 has 128 divisors (see below), whose sum is σ = 1347036480. Its totient is φ = 100155392.

The previous prime is 399089239. The next prime is 399089287. The reversal of 399089280 is 82980993.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399089287) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26527 + ... + 38753.

Almost surely, 2^399089280 is an apocalyptic number.

399089280 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 399089280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (673518240).

399089280 is an abundant number, since it is smaller than the sum of its proper divisors (947947200).

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

399089280 is a wasteful number, since it uses less digits than its factorization.

399089280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12266 (or 12254 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 48.

The square root of 399089280 is about 19977.2190256802. The cubic root of 399089280 is about 736.2466879438.

The spelling of 399089280 in words is "three hundred ninety-nine million, eighty-nine thousand, two hundred eighty".