136439903 has 4 divisors (see below), whose sum is σ = 139612968. Its totient is φ = 133266840.

The previous prime is 136439899. The next prime is 136439917. The reversal of 136439903 is 309934631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 309934631 = 19 ⋅16312349.

It is a cyclic number.

It is not a de Polignac number, because 136439903 - 2² = 136439899 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 (136432903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1586468 + ... + 1586553.

It is an arithmetic number, because the mean of its divisors is an integer number (34903242).

Almost surely, 2^136439903 is an apocalyptic number.

136439903 is a deficient number, since it is larger than the sum of its proper divisors (3173065).

136439903 is an equidigital number, since it uses as much as digits as its factorization.

136439903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3173064.

The product of its (nonzero) digits is 52488, while the sum is 38.

The square root of 136439903 is about 11680.7492482289. The cubic root of 136439903 is about 514.8101892650.

The spelling of 136439903 in words is "one hundred thirty-six million, four hundred thirty-nine thousand, nine hundred three".