215423838 has 24 divisors (see below), whose sum is σ = 533430768. Its totient is φ = 61549632.

The previous prime is 215423837. The next prime is 215423839. The reversal of 215423838 is 838324512.

It is an interprime number because it is at equal distance from previous prime (215423837) and next prime (215423839).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215423833) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 854731 + ... + 854982.

It is an arithmetic number, because the mean of its divisors is an integer number (22226282).

Almost surely, 2^215423838 is an apocalyptic number.

215423838 is an abundant number, since it is smaller than the sum of its proper divisors (318006930).

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

215423838 is a wasteful number, since it uses less digits than its factorization.

215423838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1709728 (or 1709725 counting only the distinct ones).

The product of its digits is 46080, while the sum is 36.

The square root of 215423838 is about 14677.3239386477. The cubic root of 215423838 is about 599.4660416217.

The spelling of 215423838 in words is "two hundred fifteen million, four hundred twenty-three thousand, eight hundred thirty-eight".