215394242 has 16 divisors (see below), whose sum is σ = 379227840. Its totient is φ = 89816688.

The previous prime is 215394227. The next prime is 215394247. The reversal of 215394242 is 242493512.

It is a junction number, because it is equal to n+sod(n) for n = 215394199 and 215394208.

It is not an unprimeable number, because it can be changed into a prime (215394247) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 207392 + ... + 208427.

It is an arithmetic number, because the mean of its divisors is an integer number (23701740).

Almost surely, 2^215394242 is an apocalyptic number.

215394242 is a deficient number, since it is larger than the sum of its proper divisors (163833598).

215394242 is a wasteful number, since it uses less digits than its factorization.

215394242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 415865.

The product of its digits is 17280, while the sum is 32.

The square root of 215394242 is about 14676.3156820777. The cubic root of 215394242 is about 599.4385878207.

The spelling of 215394242 in words is "two hundred fifteen million, three hundred ninety-four thousand, two hundred forty-two".