215243392 has 128 divisors (see below), whose sum is σ = 559319040. Its totient is φ = 80068608.

The previous prime is 215243377. The next prime is 215243401. The reversal of 215243392 is 293342512.

It is a tau number, because it is divible by the number of its divisors (128).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 197473 + ... + 198559.

It is an arithmetic number, because the mean of its divisors is an integer number (4369680).

Almost surely, 2^215243392 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 215243392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (279659520).

215243392 is an abundant number, since it is smaller than the sum of its proper divisors (344075648).

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

215243392 is a wasteful number, since it uses less digits than its factorization.

215243392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1138 (or 1126 counting only the distinct ones).

The product of its digits is 12960, while the sum is 31.

The square root of 215243392 is about 14671.1755493553. The cubic root of 215243392 is about 599.2986174607.

The spelling of 215243392 in words is "two hundred fifteen million, two hundred forty-three thousand, three hundred ninety-two".