136391979 has 8 divisors (see below), whose sum is σ = 185725440. Its totient is φ = 88993256.

The previous prime is 136391977. The next prime is 136391987. The reversal of 136391979 is 979193631.

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 136391979 - 2¹ = 136391977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (136391977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 483519 + ... + 483800.

It is an arithmetic number, because the mean of its divisors is an integer number (23215680).

Almost surely, 2^136391979 is an apocalyptic number.

136391979 is a deficient number, since it is larger than the sum of its proper divisors (49333461).

136391979 is an equidigital number, since it uses as much as digits as its factorization.

136391979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 967369.

The product of its digits is 275562, while the sum is 48.

The square root of 136391979 is about 11678.6976585577. The cubic root of 136391979 is about 514.7499071624.

The spelling of 136391979 in words is "one hundred thirty-six million, three hundred ninety-one thousand, nine hundred seventy-nine".