136942493 has 4 divisors (see below), whose sum is σ = 136975740. Its totient is φ = 136909248.

The previous prime is 136942451. The next prime is 136942523. The reversal of 136942493 is 394249631.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 27489049 + 109453444 = 5243^2 + 10462^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-136942493 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 136942493.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136942423) 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, 9398 + ... + 19031.

It is an arithmetic number, because the mean of its divisors is an integer number (34243935).

Almost surely, 2^136942493 is an apocalyptic number.

It is an amenable number.

136942493 is a deficient number, since it is larger than the sum of its proper divisors (33247).

136942493 is an equidigital number, since it uses as much as digits as its factorization.

136942493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33246.

The product of its digits is 139968, while the sum is 41.

The square root of 136942493 is about 11702.2430755817. The cubic root of 136942493 is about 515.4415329301.

The spelling of 136942493 in words is "one hundred thirty-six million, nine hundred forty-two thousand, four hundred ninety-three".