136726381 has 4 divisors (see below), whose sum is σ = 149156064. Its totient is φ = 124296700.

The previous prime is 136726367. The next prime is 136726391. The reversal of 136726381 is 183627631.

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.

It is not a de Polignac number, because 136726381 - 2¹¹ = 136724333 is a prime.

It is a super-2 number, since 2×136726381² = 37388206522714322, which contains 22 as substring.

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 136726381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136726301) 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, 6214825 + ... + 6214846.

It is an arithmetic number, because the mean of its divisors is an integer number (37289016).

Almost surely, 2^136726381 is an apocalyptic number.

136726381 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

136726381 is a deficient number, since it is larger than the sum of its proper divisors (12429683).

136726381 is a wasteful number, since it uses less digits than its factorization.

136726381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12429682.

The product of its digits is 36288, while the sum is 37.

The square root of 136726381 is about 11693.0056444013. The cubic root of 136726381 is about 515.1702469158.

The spelling of 136726381 in words is "one hundred thirty-six million, seven hundred twenty-six thousand, three hundred eighty-one".