399360780 has 504 divisors, whose sum is σ = 1611851472. Its totient is φ = 82301184.

The previous prime is 399360779. The next prime is 399360809. The reversal of 399360780 is 87063993.

It is a happy number.

399360780 is a `hidden beast` number, since 39 + 9 + 3 + 607 + 8 + 0 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 167 ways as a sum of consecutive naturals, for example, 9287439 + ... + 9287481.

It is an arithmetic number, because the mean of its divisors is an integer number (3198118).

Almost surely, 2^399360780 is an apocalyptic number.

399360780 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 399360780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (805925736).

399360780 is an abundant number, since it is smaller than the sum of its proper divisors (1212490692).

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

399360780 is a wasteful number, since it uses less digits than its factorization.

399360780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97 (or 73 counting only the distinct ones).

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

The square root of 399360780 is about 19984.0131104841. The cubic root of 399360780 is about 736.4136060366.

The spelling of 399360780 in words is "three hundred ninety-nine million, three hundred sixty thousand, seven hundred eighty".