215826013 has 12 divisors (see below), whose sum is σ = 237009888. Its totient is φ = 196407120.

The previous prime is 215826011. The next prime is 215826031. The reversal of 215826013 is 310628512.

It is not a de Polignac number, because 215826013 - 2¹ = 215826011 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215826011) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3006 + ... + 20992.

It is an arithmetic number, because the mean of its divisors is an integer number (19750824).

Almost surely, 2^215826013 is an apocalyptic number.

It is an amenable number.

215826013 is a deficient number, since it is larger than the sum of its proper divisors (21183875).

215826013 is a wasteful number, since it uses less digits than its factorization.

215826013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18084 (or 18071 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 215826013 is about 14691.0181063124. The cubic root of 215826013 is about 599.8388576517.

The spelling of 215826013 in words is "two hundred fifteen million, eight hundred twenty-six thousand, thirteen".