399516 has 36 divisors (see below), whose sum is σ = 1014552. Its totient is φ = 122304.

The previous prime is 399499. The next prime is 399523. The reversal of 399516 is 615993.

It is a super-2 number, since 2×399516² = 319226068512, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

399516 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1930 + ... + 2126.

It is an arithmetic number, because the mean of its divisors is an integer number (28182).

2³⁹⁹⁵¹⁶ 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 399516, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (507276).

399516 is an abundant number, since it is smaller than the sum of its proper divisors (615036).

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

399516 is a wasteful number, since it uses less digits than its factorization.

399516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230 (or 215 counting only the distinct ones).

The product of its digits is 7290, while the sum is 33.

The square root of 399516 is about 632.0727806194. The cubic root of 399516 is about 73.6509001245.

The spelling of 399516 in words is "three hundred ninety-nine thousand, five hundred sixteen".