135978215 has 8 divisors (see below), whose sum is σ = 163250880. Its totient is φ = 108731232.

The previous prime is 135978209. The next prime is 135978229. The reversal of 135978215 is 512879531.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 135978215 - 2⁶ = 135978151 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8306 + ... + 18464.

It is an arithmetic number, because the mean of its divisors is an integer number (20406360).

Almost surely, 2^135978215 is an apocalyptic number.

135978215 is a deficient number, since it is larger than the sum of its proper divisors (27272665).

135978215 is a wasteful number, since it uses less digits than its factorization.

135978215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12841.

The product of its digits is 75600, while the sum is 41.

The square root of 135978215 is about 11660.9697281144. The cubic root of 135978215 is about 514.2288581509.

It can be divided in two parts, 13597 and 8215, that added together give a palindrome (21812).

The spelling of 135978215 in words is "one hundred thirty-five million, nine hundred seventy-eight thousand, two hundred fifteen".