136640426 has 16 divisors (see below), whose sum is σ = 221356800. Its totient is φ = 62884848.

The previous prime is 136640393. The next prime is 136640429. The reversal of 136640426 is 624046631.

136640426 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×136640426² = 37341212034922952, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 136640392 and 136640401.

It is not an unprimeable number, because it can be changed into a prime (136640429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2015 + ... + 16653.

It is an arithmetic number, because the mean of its divisors is an integer number (13834800).

Almost surely, 2^136640426 is an apocalyptic number.

136640426 is a deficient number, since it is larger than the sum of its proper divisors (84716374).

136640426 is a wasteful number, since it uses less digits than its factorization.

136640426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15013.

The product of its (nonzero) digits is 20736, while the sum is 32.

The square root of 136640426 is about 11689.3295787226. The cubic root of 136640426 is about 515.0622678975.

The spelling of 136640426 in words is "one hundred thirty-six million, six hundred forty thousand, four hundred twenty-six".