68943839 has 4 divisors (see below), whose sum is σ = 70807224. Its totient is φ = 67080456.

The previous prime is 68943829. The next prime is 68943841. The reversal of 68943839 is 93834986.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68943839 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68943829) 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, 931637 + ... + 931710.

It is an arithmetic number, because the mean of its divisors is an integer number (17701806).

Almost surely, 2^68943839 is an apocalyptic number.

68943839 is a deficient number, since it is larger than the sum of its proper divisors (1863385).

68943839 is a wasteful number, since it uses less digits than its factorization.

68943839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1863384.

The product of its digits is 1119744, while the sum is 50.

The square root of 68943839 is about 8303.2426798209. The cubic root of 68943839 is about 410.0452835171.

The spelling of 68943839 in words is "sixty-eight million, nine hundred forty-three thousand, eight hundred thirty-nine".