2235721 has 8 divisors (see below), whose sum is σ = 2380320. Its totient is φ = 2092608.

The previous prime is 2235707. The next prime is 2235731. The reversal of 2235721 is 1275322.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2235721 - 2²¹ = 138569 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2235692 and 2235701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2235731) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5710 + ... + 6088.

It is an arithmetic number, because the mean of its divisors is an integer number (297540).

2^2235721 is an apocalyptic number.

It is an amenable number.

2235721 is a deficient number, since it is larger than the sum of its proper divisors (144599).

2235721 is a wasteful number, since it uses less digits than its factorization.

2235721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 743.

The product of its digits is 840, while the sum is 22.

The square root of 2235721 is about 1495.2327578006. The cubic root of 2235721 is about 130.7592844622.

The spelling of 2235721 in words is "two million, two hundred thirty-five thousand, seven hundred twenty-one".