2318921 has 4 divisors (see below), whose sum is σ = 2529744. Its totient is φ = 2108100.

The previous prime is 2318917. The next prime is 2318923. The reversal of 2318921 is 1298132.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2318921 - 2² = 2318917 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2318923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105395 + ... + 105416.

It is an arithmetic number, because the mean of its divisors is an integer number (632436).

2^2318921 is an apocalyptic number.

It is an amenable number.

2318921 is a deficient number, since it is larger than the sum of its proper divisors (210823).

2318921 is a wasteful number, since it uses less digits than its factorization.

2318921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210822.

The product of its digits is 864, while the sum is 26.

The square root of 2318921 is about 1522.8003808773. The cubic root of 2318921 is about 132.3615927455.

The spelling of 2318921 in words is "two million, three hundred eighteen thousand, nine hundred twenty-one".