136640393 has 2 divisors, whose sum is σ = 136640394. Its totient is φ = 136640392.

The previous prime is 136640389. The next prime is 136640429. The reversal of 136640393 is 393046631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 89264704 + 47375689 = 9448^2 + 6883^2 .

It is a cyclic number.

It is not a de Polignac number, because 136640393 - 2² = 136640389 is a prime.

It is not a weakly prime, because it can be changed into another prime (136640323) 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 as a sum of consecutive naturals, namely, 68320196 + 68320197.

It is an arithmetic number, because the mean of its divisors is an integer number (68320197).

Almost surely, 2^136640393 is an apocalyptic number.

It is an amenable number.

136640393 is a deficient number, since it is larger than the sum of its proper divisors (1).

136640393 is an equidigital number, since it uses as much as digits as its factorization.

136640393 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34992, while the sum is 35.

The square root of 136640393 is about 11689.3281671788. The cubic root of 136640393 is about 515.0622264333.

The spelling of 136640393 in words is "one hundred thirty-six million, six hundred forty thousand, three hundred ninety-three".