215745942 has 16 divisors (see below), whose sum is σ = 431686080. Its totient is φ = 71882952.

The previous prime is 215745917. The next prime is 215745947. The reversal of 215745942 is 249547512.

It is a super-2 number, since 2×215745942² = 93092622978934728, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 215745942.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215745947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9193 + ... + 22715.

It is an arithmetic number, because the mean of its divisors is an integer number (26980380).

Almost surely, 2^215745942 is an apocalyptic number.

215745942 is an abundant number, since it is smaller than the sum of its proper divisors (215940138).

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

215745942 is a wasteful number, since it uses less digits than its factorization.

215745942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16187.

The product of its digits is 100800, while the sum is 39.

The square root of 215745942 is about 14688.2926849924. The cubic root of 215745942 is about 599.7646688219.

The spelling of 215745942 in words is "two hundred fifteen million, seven hundred forty-five thousand, nine hundred forty-two".