136839391 has 8 divisors (see below), whose sum is σ = 147787920. Its totient is φ = 125951232.

The previous prime is 136839383. The next prime is 136839401. The reversal of 136839391 is 193938631.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 136839391 - 2³ = 136839383 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 (136834391) 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, 10321 + ... + 19498.

It is an arithmetic number, because the mean of its divisors is an integer number (18473490).

Almost surely, 2^136839391 is an apocalyptic number.

136839391 is a deficient number, since it is larger than the sum of its proper divisors (10948529).

136839391 is a wasteful number, since it uses less digits than its factorization.

136839391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30185.

The product of its digits is 104976, while the sum is 43.

The square root of 136839391 is about 11697.8370222875. The cubic root of 136839391 is about 515.3121443227.

The spelling of 136839391 in words is "one hundred thirty-six million, eight hundred thirty-nine thousand, three hundred ninety-one".