136280389 has 4 divisors (see below), whose sum is σ = 155749024. Its totient is φ = 116811756.

The previous prime is 136280387. The next prime is 136280467. The reversal of 136280389 is 983082631.

136280389 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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: 983082631 = 151 ⋅6510481.

It is a cyclic number.

It is not a de Polignac number, because 136280389 - 2¹ = 136280387 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 (136280387) 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, 9734307 + ... + 9734320.

It is an arithmetic number, because the mean of its divisors is an integer number (38937256).

Almost surely, 2^136280389 is an apocalyptic number.

It is an amenable number.

136280389 is a deficient number, since it is larger than the sum of its proper divisors (19468635).

136280389 is an equidigital number, since it uses as much as digits as its factorization.

136280389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19468634.

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 136280389 is about 11673.9191790932. The cubic root of 136280389 is about 514.6094868461.

The spelling of 136280389 in words is "one hundred thirty-six million, two hundred eighty thousand, three hundred eighty-nine".