215115389 has 8 divisors (see below), whose sum is σ = 225480192. Its totient is φ = 204834960.

The previous prime is 215115377. The next prime is 215115401. The reversal of 215115389 is 983511512.

It is an interprime number because it is at equal distance from previous prime (215115377) and next prime (215115401).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 215115389 - 2²⁰ = 214066813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215115319) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15842 + ... + 26099.

It is an arithmetic number, because the mean of its divisors is an integer number (28185024).

Almost surely, 2^215115389 is an apocalyptic number.

It is an amenable number.

215115389 is a deficient number, since it is larger than the sum of its proper divisors (10364803).

215115389 is a wasteful number, since it uses less digits than its factorization.

215115389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42187.

The product of its digits is 10800, while the sum is 35.

The square root of 215115389 is about 14666.8125030628. The cubic root of 215115389 is about 599.1797950246.

The spelling of 215115389 in words is "two hundred fifteen million, one hundred fifteen thousand, three hundred eighty-nine".