399550008 has 128 divisors (see below), whose sum is σ = 1198955520. Its totient is φ = 109340160.

The previous prime is 399550007. The next prime is 399550009. The reversal of 399550008 is 800055993.

It is an interprime number because it is at equal distance from previous prime (399550007) and next prime (399550009).

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399550003) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 160066 + ... + 162542.

It is an arithmetic number, because the mean of its divisors is an integer number (9366840).

Almost surely, 2^399550008 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 399550008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (599477760).

399550008 is an abundant number, since it is smaller than the sum of its proper divisors (799405512).

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

399550008 is a wasteful number, since it uses less digits than its factorization.

399550008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2557 (or 2553 counting only the distinct ones).

The product of its (nonzero) digits is 48600, while the sum is 39.

The square root of 399550008 is about 19988.7470342691. The cubic root of 399550008 is about 736.5298986032.

The spelling of 399550008 in words is "three hundred ninety-nine million, five hundred fifty thousand, eight".