135638217 has 72 divisors (see below), whose sum is σ = 236834208. Its totient is φ = 74748960.

The previous prime is 135638213. The next prime is 135638219. The reversal of 135638217 is 712836531.

135638217 is a `hidden beast` number, since 1 + 3 + 5 + 638 + 2 + 17 = 666.

It is not a de Polignac number, because 135638217 - 2² = 135638213 is a prime.

It is not an unprimeable number, because it can be changed into a prime (135638213) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 2024418 + ... + 2024484.

It is an arithmetic number, because the mean of its divisors is an integer number (3289364).

Almost surely, 2^135638217 is an apocalyptic number.

It is an amenable number.

135638217 is a deficient number, since it is larger than the sum of its proper divisors (101195991).

135638217 is a wasteful number, since it uses less digits than its factorization.

135638217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132 (or 94 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 135638217 is about 11646.3821421075. The cubic root of 135638217 is about 513.7999102594.

The spelling of 135638217 in words is "one hundred thirty-five million, six hundred thirty-eight thousand, two hundred seventeen".