399780360 has 160 divisors (see below), whose sum is σ = 1535751360. Its totient is φ = 91373184.

The previous prime is 399780343. The next prime is 399780361. The reversal of 399780360 is 63087993.

It is a happy number.

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 (399780361) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 13867 + ... + 31493.

It is an arithmetic number, because the mean of its divisors is an integer number (9598446).

Almost surely, 2^399780360 is an apocalyptic number.

399780360 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 399780360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (767875680).

399780360 is an abundant number, since it is smaller than the sum of its proper divisors (1135971000).

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

399780360 is a wasteful number, since it uses less digits than its factorization.

399780360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17657 (or 17644 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 45.

The square root of 399780360 is about 19994.5082460160. The cubic root of 399780360 is about 736.6714149236.

The spelling of 399780360 in words is "three hundred ninety-nine million, seven hundred eighty thousand, three hundred sixty".