399317760 has 216 divisors, whose sum is σ = 1463585760. Its totient is φ = 100171776.

The previous prime is 399317753. The next prime is 399317767. The reversal of 399317760 is 67713993.

It is an interprime number because it is at equal distance from previous prime (399317753) and next prime (399317767).

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 (399317767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 194821 + ... + 196859.

It is an arithmetic number, because the mean of its divisors is an integer number (6775860).

Almost surely, 2^399317760 is an apocalyptic number.

399317760 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 399317760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (731792880).

399317760 is an abundant number, since it is smaller than the sum of its proper divisors (1064268000).

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

399317760 is a wasteful number, since it uses less digits than its factorization.

399317760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2083 (or 2066 counting only the distinct ones).

The product of its (nonzero) digits is 214326, while the sum is 45.

The square root of 399317760 is about 19982.9367211128. The cubic root of 399317760 is about 736.3871624025.

The spelling of 399317760 in words is "three hundred ninety-nine million, three hundred seventeen thousand, seven hundred sixty".