215491242 has 8 divisors (see below), whose sum is σ = 430982496. Its totient is φ = 71830412.

The previous prime is 215491207. The next prime is 215491249. The reversal of 215491242 is 242194512.

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

215491242 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (215491249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17957598 + ... + 17957609.

It is an arithmetic number, because the mean of its divisors is an integer number (53872812).

Almost surely, 2^215491242 is an apocalyptic number.

215491242 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

215491242 is a wasteful number, since it uses less digits than its factorization.

215491242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35915212.

The product of its digits is 5760, while the sum is 30.

The square root of 215491242 is about 14679.6199542086. The cubic root of 215491242 is about 599.5285574447.

It can be divided in two parts, 21549 and 1242, that added together give a triangular number (22791 = T₂₁₃).

The spelling of 215491242 in words is "two hundred fifteen million, four hundred ninety-one thousand, two hundred forty-two".