215190923 has 4 divisors (see below), whose sum is σ = 215237880. Its totient is φ = 215143968.

The previous prime is 215190917. The next prime is 215190929. The reversal of 215190923 is 329091512.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (215190917) and next prime (215190929).

It is a cyclic number.

It is not a de Polignac number, because 215190923 - 2⁴ = 215190907 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 215190923.

It is not an unprimeable number, because it can be changed into a prime (215190929) 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, 15758 + ... + 26051.

It is an arithmetic number, because the mean of its divisors is an integer number (53809470).

Almost surely, 2^215190923 is an apocalyptic number.

215190923 is a deficient number, since it is larger than the sum of its proper divisors (46957).

215190923 is an equidigital number, since it uses as much as digits as its factorization.

215190923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46956.

The product of its (nonzero) digits is 4860, while the sum is 32.

The square root of 215190923 is about 14669.3872741843. The cubic root of 215190923 is about 599.2499173137.

The spelling of 215190923 in words is "two hundred fifteen million, one hundred ninety thousand, nine hundred twenty-three".