136831238 has 4 divisors (see below), whose sum is σ = 205246860. Its totient is φ = 68415618.

The previous prime is 136831237. The next prime is 136831243. The reversal of 136831238 is 832138631.

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

It is a super-2 number, since 2×136831238² = 37445575385225288, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 136831198 and 136831207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136831237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34207808 + ... + 34207811.

It is an arithmetic number, because the mean of its divisors is an integer number (51311715).

Almost surely, 2^136831238 is an apocalyptic number.

136831238 is a deficient number, since it is larger than the sum of its proper divisors (68415622).

136831238 is an equidigital number, since it uses as much as digits as its factorization.

136831238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68415621.

The product of its digits is 20736, while the sum is 35.

The square root of 136831238 is about 11697.4885338691. The cubic root of 136831238 is about 515.3019098833.

Adding to 136831238 its reverse (832138631), we get a palindrome (968969869).

The spelling of 136831238 in words is "one hundred thirty-six million, eight hundred thirty-one thousand, two hundred thirty-eight".