399361590 has 80 divisors (see below), whose sum is σ = 1087606080. Its totient is φ = 105148368.

The previous prime is 399361577. The next prime is 399361621. The reversal of 399361590 is 95163993.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 5055171 + ... + 5055249.

It is an arithmetic number, because the mean of its divisors is an integer number (13595076).

Almost surely, 2^399361590 is an apocalyptic number.

399361590 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 399361590, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (543803040).

399361590 is an abundant number, since it is smaller than the sum of its proper divisors (688244490).

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

399361590 is an frugal number, since it uses more digits than its factorization.

399361590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256 (or 89 counting only the distinct ones).

The product of its (nonzero) digits is 196830, while the sum is 45.

The square root of 399361590 is about 19984.0333766735. The cubic root of 399361590 is about 736.4141039111.

The spelling of 399361590 in words is "three hundred ninety-nine million, three hundred sixty-one thousand, five hundred ninety".