68199839 has 4 divisors (see below), whose sum is σ = 68453640. Its totient is φ = 67946040.

The previous prime is 68199829. The next prime is 68199847. The reversal of 68199839 is 93899186.

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 68199839 - 2⁴ = 68199823 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 (68199809) 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, 126497 + ... + 127034.

It is an arithmetic number, because the mean of its divisors is an integer number (17113410).

Almost surely, 2^68199839 is an apocalyptic number.

68199839 is a deficient number, since it is larger than the sum of its proper divisors (253801).

68199839 is a wasteful number, since it uses less digits than its factorization.

68199839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253800.

The product of its digits is 839808, while the sum is 53.

The square root of 68199839 is about 8258.3193810847. The cubic root of 68199839 is about 408.5649592797.

The spelling of 68199839 in words is "sixty-eight million, one hundred ninety-nine thousand, eight hundred thirty-nine".