215307923 has 8 divisors (see below), whose sum is σ = 221641728. Its totient is φ = 209034504.

The previous prime is 215307913. The next prime is 215307929. The reversal of 215307923 is 329703512.

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

It is a cyclic number.

It is not a de Polignac number, because 215307923 - 2⁸ = 215307667 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 215307923.

It is not an unprimeable number, because it can be changed into a prime (215307929) 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, 7811 + ... + 22172.

It is an arithmetic number, because the mean of its divisors is an integer number (27705216).

Almost surely, 2^215307923 is an apocalyptic number.

215307923 is a deficient number, since it is larger than the sum of its proper divisors (6333805).

215307923 is a wasteful number, since it uses less digits than its factorization.

215307923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30193.

The product of its (nonzero) digits is 11340, while the sum is 32.

The square root of 215307923 is about 14673.3746288984. The cubic root of 215307923 is about 599.3585023420.

The spelling of 215307923 in words is "two hundred fifteen million, three hundred seven thousand, nine hundred twenty-three".