2345921 has 2 divisors, whose sum is σ = 2345922. Its totient is φ = 2345920.

The previous prime is 2345909. The next prime is 2345923. The reversal of 2345921 is 1295432.

2345921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1597696 + 748225 = 1264^2 + 865^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2345921 is a prime.

Together with 2345923, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2345923) by changing a digit.

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 as a sum of consecutive naturals, namely, 1172960 + 1172961.

It is an arithmetic number, because the mean of its divisors is an integer number (1172961).

2^2345921 is an apocalyptic number.

It is an amenable number.

2345921 is a deficient number, since it is larger than the sum of its proper divisors (1).

2345921 is an equidigital number, since it uses as much as digits as its factorization.

2345921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2160, while the sum is 26.

The square root of 2345921 is about 1531.6399707503. The cubic root of 2345921 is about 132.8733223885.

The spelling of 2345921 in words is "two million, three hundred forty-five thousand, nine hundred twenty-one".