136642393 has 4 divisors (see below), whose sum is σ = 136863760. Its totient is φ = 136421028.

The previous prime is 136642391. The next prime is 136642397. The reversal of 136642393 is 393246631.

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: 393246631 = 101 ⋅3893531.

It is a cyclic number.

It is not a de Polignac number, because 136642393 - 2¹ = 136642391 is a prime.

It is a super-2 number, since 2×136642393² = 37342287129532898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (136642391) 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, 109755 + ... + 110992.

It is an arithmetic number, because the mean of its divisors is an integer number (34215940).

Almost surely, 2^136642393 is an apocalyptic number.

It is an amenable number.

136642393 is a deficient number, since it is larger than the sum of its proper divisors (221367).

136642393 is an equidigital number, since it uses as much as digits as its factorization.

136642393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221366.

The product of its digits is 69984, while the sum is 37.

The square root of 136642393 is about 11689.4137149816. The cubic root of 136642393 is about 515.0647394028.

The spelling of 136642393 in words is "one hundred thirty-six million, six hundred forty-two thousand, three hundred ninety-three".