87239 has 4 divisors (see below), whose sum is σ = 91056. Its totient is φ = 83424.

The previous prime is 87223. The next prime is 87251. The reversal of 87239 is 93278.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93278 = 2 ⋅46639.

It is a cyclic number.

It is not a de Polignac number, because 87239 - 2⁴ = 87223 is a prime.

It is a super-2 number, since 2×87239² = 15221286242, 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 (87299) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1874 + ... + 1919.

It is an arithmetic number, because the mean of its divisors is an integer number (22764).

2⁸⁷²³⁹ is an apocalyptic number.

87239 is a deficient number, since it is larger than the sum of its proper divisors (3817).

87239 is a wasteful number, since it uses less digits than its factorization.

87239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3816.

The product of its digits is 3024, while the sum is 29.

The square root of 87239 is about 295.3624891553. The cubic root of 87239 is about 44.3510146117.

The spelling of 87239 in words is "eighty-seven thousand, two hundred thirty-nine".