136639873 has 4 divisors (see below), whose sum is σ = 136668208. Its totient is φ = 136611540.

The previous prime is 136639861. The next prime is 136639879. The reversal of 136639873 is 378936631.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 136639873 - 2²¹ = 134542721 is a prime.

It is a super-2 number, since 2×136639873² = 37340909786912258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (136639879) 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 3 ways as a sum of consecutive naturals, for example, 4923 + ... + 17248.

It is an arithmetic number, because the mean of its divisors is an integer number (34167052).

Almost surely, 2^136639873 is an apocalyptic number.

It is an amenable number.

136639873 is a deficient number, since it is larger than the sum of its proper divisors (28335).

136639873 is an equidigital number, since it uses as much as digits as its factorization.

136639873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28334.

The product of its digits is 489888, while the sum is 46.

The square root of 136639873 is about 11689.3059246475. The cubic root of 136639873 is about 515.0615730572.

The spelling of 136639873 in words is "one hundred thirty-six million, six hundred thirty-nine thousand, eight hundred seventy-three".