399565386 has 96 divisors (see below), whose sum is σ = 1011419136. Its totient is φ = 117126000.

The previous prime is 399565363. The next prime is 399565429. The reversal of 399565386 is 683565993.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 164521 + ... + 166931.

It is an arithmetic number, because the mean of its divisors is an integer number (10535616).

Almost surely, 2^399565386 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 399565386, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (505709568).

399565386 is an abundant number, since it is smaller than the sum of its proper divisors (611853750).

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

399565386 is a wasteful number, since it uses less digits than its factorization.

399565386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2470 (or 2458 counting only the distinct ones).

The product of its digits is 5248800, while the sum is 54.

The square root of 399565386 is about 19989.1316969997. The cubic root of 399565386 is about 736.5393477429.

The spelling of 399565386 in words is "three hundred ninety-nine million, five hundred sixty-five thousand, three hundred eighty-six".