399625 has 16 divisors (see below), whose sum is σ = 524160. Its totient is φ = 303600.

The previous prime is 399617. The next prime is 399643. The reversal of 399625 is 526993.

It is a happy number.

It is not a de Polignac number, because 399625 - 2³ = 399617 is a prime.

It is an unprimeable 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 15 ways as a sum of consecutive naturals, for example, 2806 + ... + 2944.

It is an arithmetic number, because the mean of its divisors is an integer number (32760).

2³⁹⁹⁶²⁵ is an apocalyptic number.

It is an amenable number.

399625 is a deficient number, since it is larger than the sum of its proper divisors (124535).

399625 is a wasteful number, since it uses less digits than its factorization.

399625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177 (or 167 counting only the distinct ones).

The product of its digits is 14580, while the sum is 34.

The square root of 399625 is about 632.1589989868. The cubic root of 399625 is about 73.6575975768.

It can be divided in two parts, 399 and 625, that added together give a 10-th power (1024 = 2¹⁰).

The spelling of 399625 in words is "three hundred ninety-nine thousand, six hundred twenty-five".