399861360 has 240 divisors, whose sum is σ = 1417992576. Its totient is φ = 104696064.

The previous prime is 399861311. The next prime is 399861361. The reversal of 399861360 is 63168993.

It is a tau number, because it is divible by the number of its divisors (240).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399861361) 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, 1302327 + ... + 1302633.

Almost surely, 2^399861360 is an apocalyptic number.

399861360 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 399861360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (708996288).

399861360 is an abundant number, since it is smaller than the sum of its proper divisors (1018131216).

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

399861360 is a wasteful number, since it uses less digits than its factorization.

399861360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402 (or 384 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 45.

The square root of 399861360 is about 19996.5336996190. The cubic root of 399861360 is about 736.7211642035.

The spelling of 399861360 in words is "three hundred ninety-nine million, eight hundred sixty-one thousand, three hundred sixty".