399501 has 6 divisors (see below), whose sum is σ = 577070. Its totient is φ = 266328.

The previous prime is 399499. The next prime is 399523. The reversal of 399501 is 105993.

It can be written as a sum of positive squares in only one way, i.e., 396900 + 2601 = 630^2 + 51^2 .

It is not a de Polignac number, because 399501 - 2¹ = 399499 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399541) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22186 + ... + 22203.

2³⁹⁹⁵⁰¹ is an apocalyptic number.

It is an amenable number.

399501 is a deficient number, since it is larger than the sum of its proper divisors (177569).

399501 is a wasteful number, since it uses less digits than its factorization.

399501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44395 (or 44392 counting only the distinct ones).

The product of its (nonzero) digits is 1215, while the sum is 27.

The square root of 399501 is about 632.0609147859. The cubic root of 399501 is about 73.6499783613.

It can be divided in two parts, 399 and 501, that added together give a square (900 = 30²).

The spelling of 399501 in words is "three hundred ninety-nine thousand, five hundred one".