215123238 has 72 divisors (see below), whose sum is σ = 524467944. Its totient is φ = 63645120.

The previous prime is 215123231. The next prime is 215123243. The reversal of 215123238 is 832321512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215123231) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 92506 + ... + 94802.

It is an arithmetic number, because the mean of its divisors is an integer number (7284277).

Almost surely, 2^215123238 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 215123238, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (262233972).

215123238 is an abundant number, since it is smaller than the sum of its proper divisors (309344706).

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

215123238 is a wasteful number, since it uses less digits than its factorization.

215123238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2370 (or 2356 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 215123238 is about 14667.0800775069. The cubic root of 215123238 is about 599.1870824391.

The spelling of 215123238 in words is "two hundred fifteen million, one hundred twenty-three thousand, two hundred thirty-eight".