399175680 has 208 divisors, whose sum is σ = 1309249440. Its totient is φ = 103809024.

The previous prime is 399175669. The next prime is 399175681. The reversal of 399175680 is 86571993.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399175681) 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, 4485076 + ... + 4485164.

Almost surely, 2^399175680 is an apocalyptic number.

399175680 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 399175680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (654624720).

399175680 is an abundant number, since it is smaller than the sum of its proper divisors (910073760).

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

399175680 is an equidigital number, since it uses as much as digits as its factorization.

399175680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194 (or 172 counting only the distinct ones).

The product of its (nonzero) digits is 408240, while the sum is 48.

The square root of 399175680 is about 19979.3813718043. The cubic root of 399175680 is about 736.2998148397.

It can be divided in two parts, 39 and 9175680, that added together give a palindrome (9175719).

The spelling of 399175680 in words is "three hundred ninety-nine million, one hundred seventy-five thousand, six hundred eighty".