215942645 has 8 divisors (see below), whose sum is σ = 259324800. Its totient is φ = 172625040.

The previous prime is 215942633. The next prime is 215942651. The reversal of 215942645 is 546249512.

It is a happy number.

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

It is not a de Polignac number, because 215942645 - 2¹⁴ = 215926261 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 215942599 and 215942608.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8441 + ... + 22430.

It is an arithmetic number, because the mean of its divisors is an integer number (32415600).

Almost surely, 2^215942645 is an apocalyptic number.

It is an amenable number.

215942645 is a deficient number, since it is larger than the sum of its proper divisors (43382155).

215942645 is a wasteful number, since it uses less digits than its factorization.

215942645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32275.

The product of its digits is 86400, while the sum is 38.

The square root of 215942645 is about 14694.9870704264. The cubic root of 215942645 is about 599.9468888173.

The spelling of 215942645 in words is "two hundred fifteen million, nine hundred forty-two thousand, six hundred forty-five".