215238455 has 4 divisors (see below), whose sum is σ = 258286152. Its totient is φ = 172190760.

The previous prime is 215238437. The next prime is 215238461. The reversal of 215238455 is 554832512.

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

It is not a de Polignac number, because 215238455 - 2¹² = 215234359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21523841 + ... + 21523850.

It is an arithmetic number, because the mean of its divisors is an integer number (64571538).

Almost surely, 2^215238455 is an apocalyptic number.

215238455 is a deficient number, since it is larger than the sum of its proper divisors (43047697).

215238455 is an equidigital number, since it uses as much as digits as its factorization.

215238455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43047696.

The product of its digits is 48000, while the sum is 35.

The square root of 215238455 is about 14671.0072932979. The cubic root of 215238455 is about 599.2940354232.

The spelling of 215238455 in words is "two hundred fifteen million, two hundred thirty-eight thousand, four hundred fifty-five".