215742135 has 16 divisors (see below), whose sum is σ = 394500096. Its totient is φ = 98624928.

The previous prime is 215742119. The next prime is 215742157. The reversal of 215742135 is 531247512.

It is not a de Polignac number, because 215742135 - 2⁴ = 215742119 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1027239 + ... + 1027448.

It is an arithmetic number, because the mean of its divisors is an integer number (24656256).

Almost surely, 2^215742135 is an apocalyptic number.

215742135 is a deficient number, since it is larger than the sum of its proper divisors (178757961).

215742135 is a wasteful number, since it uses less digits than its factorization.

215742135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2054702.

The product of its digits is 8400, while the sum is 30.

The square root of 215742135 is about 14688.1630914148. The cubic root of 215742135 is about 599.7611410344.

Adding to 215742135 its reverse (531247512), we get a palindrome (746989647).

The spelling of 215742135 in words is "two hundred fifteen million, seven hundred forty-two thousand, one hundred thirty-five".