68931239 has 4 divisors (see below), whose sum is σ = 74233656. Its totient is φ = 63628824.

The previous prime is 68931229. The next prime is 68931257. The reversal of 68931239 is 93213986.

68931239 = T₃₂₅₀ + T₃₂₅₁ + ... + T₃₂₆₂.

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

It is a cyclic number.

It is not a de Polignac number, because 68931239 - 2²⁰ = 67882663 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 68931196 and 68931205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68931229) 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, 2651189 + ... + 2651214.

It is an arithmetic number, because the mean of its divisors is an integer number (18558414).

Almost surely, 2^68931239 is an apocalyptic number.

68931239 is a deficient number, since it is larger than the sum of its proper divisors (5302417).

68931239 is a wasteful number, since it uses less digits than its factorization.

68931239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5302416.

The product of its digits is 69984, while the sum is 41.

The square root of 68931239 is about 8302.4839054346. The cubic root of 68931239 is about 410.0203023855.

The spelling of 68931239 in words is "sixty-eight million, nine hundred thirty-one thousand, two hundred thirty-nine".