813239 has 4 divisors (see below), whose sum is σ = 929424. Its totient is φ = 697056.

The previous prime is 813227. The next prime is 813251. The reversal of 813239 is 932318.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (813227) and next prime (813251).

It is a cyclic number.

It is not a de Polignac number, because 813239 - 2¹² = 809143 is a prime.

It is a super-2 number, since 2×813239² = 1322715342242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (813209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58082 + ... + 58095.

It is an arithmetic number, because the mean of its divisors is an integer number (232356).

2⁸¹³²³⁹ is an apocalyptic number.

813239 is a deficient number, since it is larger than the sum of its proper divisors (116185).

813239 is a wasteful number, since it uses less digits than its factorization.

813239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116184.

The product of its digits is 1296, while the sum is 26.

The square root of 813239 is about 901.7976491431. The cubic root of 813239 is about 93.3410608681.

The spelling of 813239 in words is "eight hundred thirteen thousand, two hundred thirty-nine".