7433721 has 8 divisors (see below), whose sum is σ = 11012960. Its totient is φ = 4955796.

The previous prime is 7433719. The next prime is 7433737. The reversal of 7433721 is 1273347.

It is not a de Polignac number, because 7433721 - 2¹ = 7433719 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 275323 = 7433721 / (7 + 4 + 3 + 3 + 7 + 2 + 1).

It is a Duffinian number.

It is a zygodrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (7433021) 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, 137635 + ... + 137688.

It is an arithmetic number, because the mean of its divisors is an integer number (1376620).

Almost surely, 2^7433721 is an apocalyptic number.

It is an amenable number.

7433721 is a deficient number, since it is larger than the sum of its proper divisors (3579239).

7433721 is a wasteful number, since it uses less digits than its factorization.

7433721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275332 (or 275326 counting only the distinct ones).

The product of its digits is 3528, while the sum is 27.

The square root of 7433721 is about 2726.4850999043. The cubic root of 7433721 is about 195.1650673318.

The spelling of 7433721 in words is "seven million, four hundred thirty-three thousand, seven hundred twenty-one".