399699846 has 160 divisors (see below), whose sum is σ = 1161135360. Its totient is φ = 99797184.

The previous prime is 399699821. The next prime is 399699887. The reversal of 399699846 is 648996993.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 279385 + ... + 280811.

It is an arithmetic number, because the mean of its divisors is an integer number (7257096).

Almost surely, 2^399699846 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 399699846, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (580567680).

399699846 is an abundant number, since it is smaller than the sum of its proper divisors (761435514).

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

399699846 is a wasteful number, since it uses less digits than its factorization.

399699846 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1480 (or 1471 counting only the distinct ones).

The product of its digits is 22674816, while the sum is 63.

The square root of 399699846 is about 19992.4947417775. The cubic root of 399699846 is about 736.6219574794.

The spelling of 399699846 in words is "three hundred ninety-nine million, six hundred ninety-nine thousand, eight hundred forty-six".