68140839 has 8 divisors (see below), whose sum is σ = 97843312. Its totient is φ = 41932800.

The previous prime is 68140837. The next prime is 68140841. The reversal of 68140839 is 93804186.

It is an interprime number because it is at equal distance from previous prime (68140837) and next prime (68140841).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 68140839 - 2¹ = 68140837 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 1747201 = 68140839 / (6 + 8 + 1 + 4 + 0 + 8 + 3 + 9).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 68140797 and 68140806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68140837) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 873562 + ... + 873639.

It is an arithmetic number, because the mean of its divisors is an integer number (12230414).

Almost surely, 2^68140839 is an apocalyptic number.

68140839 is a deficient number, since it is larger than the sum of its proper divisors (29702473).

68140839 is a wasteful number, since it uses less digits than its factorization.

68140839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1747217.

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 68140839 is about 8254.7464527991. The cubic root of 68140839 is about 408.4471081356.

The spelling of 68140839 in words is "sixty-eight million, one hundred forty thousand, eight hundred thirty-nine".