2395721 has 2 divisors, whose sum is σ = 2395722. Its totient is φ = 2395720.

The previous prime is 2395693. The next prime is 2395727. The reversal of 2395721 is 1275932.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1849600 + 546121 = 1360^2 + 739^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2395721 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is an Ulam number.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (2395727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1197860 + 1197861.

It is an arithmetic number, because the mean of its divisors is an integer number (1197861).

2^2395721 is an apocalyptic number.

It is an amenable number.

2395721 is a deficient number, since it is larger than the sum of its proper divisors (1).

2395721 is an equidigital number, since it uses as much as digits as its factorization.

2395721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3780, while the sum is 29.

The square root of 2395721 is about 1547.8116810517. The cubic root of 2395721 is about 133.8069731367.

The spelling of 2395721 in words is "two million, three hundred ninety-five thousand, seven hundred twenty-one".