215445136 has 20 divisors (see below), whose sum is σ = 427133872. Its totient is φ = 105217056.

The previous prime is 215445127. The next prime is 215445157. The reversal of 215445136 is 631544512.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 215445098 and 215445107.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 155886 + ... + 157261.

Almost surely, 2^215445136 is an apocalyptic number.

It is an amenable number.

215445136 is a deficient number, since it is larger than the sum of its proper divisors (211688736).

215445136 is a wasteful number, since it uses less digits than its factorization.

215445136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313198 (or 313192 counting only the distinct ones).

The product of its digits is 14400, while the sum is 31.

The square root of 215445136 is about 14678.0494616962. The cubic root of 215445136 is about 599.4857964875.

Adding to 215445136 its reverse (631544512), we get a palindrome (846989648).

The spelling of 215445136 in words is "two hundred fifteen million, four hundred forty-five thousand, one hundred thirty-six".