501399 has 6 divisors (see below), whose sum is σ = 724256. Its totient is φ = 334260.

The previous prime is 501383. The next prime is 501401. The reversal of 501399 is 993105.

It is not a de Polignac number, because 501399 - 2⁴ = 501383 is a prime.

It is a Duffinian number.

501399 is a lucky number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 501399.

It is not an unprimeable number, because it can be changed into a prime (501299) 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, 27847 + ... + 27864.

2⁵⁰¹³⁹⁹ is an apocalyptic number.

501399 is a deficient number, since it is larger than the sum of its proper divisors (222857).

501399 is a wasteful number, since it uses less digits than its factorization.

501399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55717 (or 55714 counting only the distinct ones).

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

The square root of 501399 is about 708.0953325648. The cubic root of 501399 is about 79.4440094665. Note that the first 3 decimals are identical.

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

The spelling of 501399 in words is "five hundred one thousand, three hundred ninety-nine".