399525 has 24 divisors (see below), whose sum is σ = 755904. Its totient is φ = 182400.

The previous prime is 399523. The next prime is 399527. The reversal of 399525 is 525993.

It is an interprime number because it is at equal distance from previous prime (399523) and next prime (399527).

It is not a de Polignac number, because 399525 - 2¹ = 399523 is a prime.

It is a d-powerful number, because it can be written as 3⁸ + 9³ + 5⁴ + 9³ + 2⁸ + 5⁸ .

It is a congruent number.

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

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 145 + ... + 905.

It is an arithmetic number, because the mean of its divisors is an integer number (31496).

2³⁹⁹⁵²⁵ is an apocalyptic number.

399525 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

399525 is a deficient number, since it is larger than the sum of its proper divisors (356379).

399525 is a wasteful number, since it uses less digits than its factorization.

399525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 781 (or 776 counting only the distinct ones).

The product of its digits is 12150, while the sum is 33.

The square root of 399525 is about 632.0799000126. The cubic root of 399525 is about 73.6514531712.

The spelling of 399525 in words is "three hundred ninety-nine thousand, five hundred twenty-five".