399522 has 8 divisors (see below), whose sum is σ = 799056. Its totient is φ = 133172.

The previous prime is 399499. The next prime is 399523. The reversal of 399522 is 225993.

It is a sphenic number, since it is the product of 3 distinct primes.

399522 is an admirable number.

It is a d-powerful number, because it can be written as 3⁷ + 9² + 5⁸ + 9⁴ + 2² + 2⁶ .

It is a self number, because there is not a number n which added to its sum of digits gives 399522.

It is not an unprimeable number, because it can be changed into a prime (399523) by changing a digit.

399522 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33288 + ... + 33299.

It is an arithmetic number, because the mean of its divisors is an integer number (99882).

2³⁹⁹⁵²² is an apocalyptic number.

399522 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

399522 is a wasteful number, since it uses less digits than its factorization.

399522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66592.

The product of its digits is 4860, while the sum is 30.

The square root of 399522 is about 632.0775268905. The cubic root of 399522 is about 73.6512688232.

The spelling of 399522 in words is "three hundred ninety-nine thousand, five hundred twenty-two".