399267520 has 112 divisors (see below), whose sum is σ = 1012606560. Its totient is φ = 149520384.

The previous prime is 399267499. The next prime is 399267521. The reversal of 399267520 is 25762993.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399267521) 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, 589422 + ... + 590098.

It is an arithmetic number, because the mean of its divisors is an integer number (9041130).

Almost surely, 2^399267520 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 399267520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (506303280).

399267520 is an abundant number, since it is smaller than the sum of its proper divisors (613339040).

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

399267520 is a wasteful number, since it uses less digits than its factorization.

399267520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 810 (or 800 counting only the distinct ones).

The product of its (nonzero) digits is 204120, while the sum is 43.

The square root of 399267520 is about 19981.6796090819. The cubic root of 399267520 is about 736.3562783578.

The spelling of 399267520 in words is "three hundred ninety-nine million, two hundred sixty-seven thousand, five hundred twenty".