2391215 has 4 divisors (see below), whose sum is σ = 2869464. Its totient is φ = 1912968.

The previous prime is 2391167. The next prime is 2391227. The reversal of 2391215 is 5121932.

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

It is a cyclic number.

It is not a de Polignac number, because 2391215 - 2¹⁰ = 2390191 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 239117 + ... + 239126.

It is an arithmetic number, because the mean of its divisors is an integer number (717366).

2^2391215 is an apocalyptic number.

2391215 is a deficient number, since it is larger than the sum of its proper divisors (478249).

2391215 is an equidigital number, since it uses as much as digits as its factorization.

2391215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 478248.

The product of its digits is 540, while the sum is 23.

The square root of 2391215 is about 1546.3553925279. The cubic root of 2391215 is about 133.7230300528.

The spelling of 2391215 in words is "two million, three hundred ninety-one thousand, two hundred fifteen".