2303721 has 40 divisors (see below), whose sum is σ = 4181760. Its totient is φ = 1233792.

The previous prime is 2303713. The next prime is 2303723. The reversal of 2303721 is 1273032.

2303721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2303721 - 2³ = 2303713 is a prime.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 2303694 and 2303703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2303723) 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 in 39 ways as a sum of consecutive naturals, for example, 9520 + ... + 9758.

It is an arithmetic number, because the mean of its divisors is an integer number (104544).

2^2303721 is an apocalyptic number.

2303721 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2303721 is a deficient number, since it is larger than the sum of its proper divisors (1878039).

2303721 is a wasteful number, since it uses less digits than its factorization.

2303721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275 (or 266 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 18.

The square root of 2303721 is about 1517.8013704039. The cubic root of 2303721 is about 132.0717585039.

Adding to 2303721 its reverse (1273032), we get a palindrome (3576753).

The spelling of 2303721 in words is "two million, three hundred three thousand, seven hundred twenty-one".