399127680 has 384 divisors, whose sum is σ = 1661212800. Its totient is φ = 86261760.

The previous prime is 399127657. The next prime is 399127681. The reversal of 399127680 is 86721993.

It is a tau number, because it is divible by the number of its divisors (384).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (399127681) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 765820 + ... + 766340.

It is an arithmetic number, because the mean of its divisors is an integer number (4326075).

Almost surely, 2^399127680 is an apocalyptic number.

399127680 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 399127680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (830606400).

399127680 is an abundant number, since it is smaller than the sum of its proper divisors (1262085120).

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

399127680 is a wasteful number, since it uses less digits than its factorization.

399127680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 572 (or 557 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 45.

The square root of 399127680 is about 19978.1800972961. The cubic root of 399127680 is about 736.2703008441.

The spelling of 399127680 in words is "three hundred ninety-nine million, one hundred twenty-seven thousand, six hundred eighty".