136740309 has 4 divisors (see below), whose sum is σ = 182320416. Its totient is φ = 91160204.

The previous prime is 136740281. The next prime is 136740323. The reversal of 136740309 is 903047631.

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, and also an emirpimes, since its reverse is a distinct semiprime: 903047631 = 3 ⋅301015877.

It is a cyclic number.

It is not a de Polignac number, because 136740309 - 2⁷ = 136740181 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 136740309.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136748309) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22790049 + ... + 22790054.

It is an arithmetic number, because the mean of its divisors is an integer number (45580104).

Almost surely, 2^136740309 is an apocalyptic number.

It is an amenable number.

136740309 is a deficient number, since it is larger than the sum of its proper divisors (45580107).

136740309 is an equidigital number, since it uses as much as digits as its factorization.

136740309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45580106.

The product of its (nonzero) digits is 13608, while the sum is 33.

The square root of 136740309 is about 11693.6011989464. The cubic root of 136740309 is about 515.1877393888.

The spelling of 136740309 in words is "one hundred thirty-six million, seven hundred forty thousand, three hundred nine".