136438815 has 16 divisors (see below), whose sum is σ = 218479968. Its totient is φ = 72708096.

The previous prime is 136438811. The next prime is 136438817. The reversal of 136438815 is 518834631.

It is not a de Polignac number, because 136438815 - 2² = 136438811 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136438811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20367 + ... + 26223.

It is an arithmetic number, because the mean of its divisors is an integer number (13654998).

Almost surely, 2^136438815 is an apocalyptic number.

136438815 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

136438815 is a deficient number, since it is larger than the sum of its proper divisors (82041153).

136438815 is a wasteful number, since it uses less digits than its factorization.

136438815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7418.

The product of its digits is 69120, while the sum is 39.

The square root of 136438815 is about 11680.7026757811. The cubic root of 136438815 is about 514.8088208604.

The spelling of 136438815 in words is "one hundred thirty-six million, four hundred thirty-eight thousand, eight hundred fifteen".