136872321 has 8 divisors (see below), whose sum is σ = 193231584. Its totient is φ = 85880640.

The previous prime is 136872317. The next prime is 136872331. The reversal of 136872321 is 123278631.

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

It is not a de Polignac number, because 136872321 - 2² = 136872317 is a prime.

It is not an unprimeable number, because it can be changed into a prime (136872331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1341835 + ... + 1341936.

It is an arithmetic number, because the mean of its divisors is an integer number (24153948).

Almost surely, 2^136872321 is an apocalyptic number.

It is an amenable number.

136872321 is a deficient number, since it is larger than the sum of its proper divisors (56359263).

136872321 is a wasteful number, since it uses less digits than its factorization.

136872321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2683791.

The product of its digits is 12096, while the sum is 33.

The square root of 136872321 is about 11699.2444627848. The cubic root of 136872321 is about 515.3534771284.

The spelling of 136872321 in words is "one hundred thirty-six million, eight hundred seventy-two thousand, three hundred twenty-one".