2365721 has 2 divisors, whose sum is σ = 2365722. Its totient is φ = 2365720.

The previous prime is 2365681. The next prime is 2365751. The reversal of 2365721 is 1275632.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2175625 + 190096 = 1475^2 + 436^2 .

It is a cyclic number.

It is not a de Polignac number, because 2365721 - 2¹⁴ = 2349337 is a prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2365751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1182860 + 1182861.

It is an arithmetic number, because the mean of its divisors is an integer number (1182861).

2^2365721 is an apocalyptic number.

It is an amenable number.

2365721 is a deficient number, since it is larger than the sum of its proper divisors (1).

2365721 is an equidigital number, since it uses as much as digits as its factorization.

2365721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2520, while the sum is 26.

The square root of 2365721 is about 1538.0900493794. The cubic root of 2365721 is about 133.2461005797.

The spelling of 2365721 in words is "two million, three hundred sixty-five thousand, seven hundred twenty-one".