7400721 has 4 divisors (see below), whose sum is σ = 9867632. Its totient is φ = 4933812.

The previous prime is 7400719. The next prime is 7400737. The reversal of 7400721 is 1270047.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 7400721 - 2¹ = 7400719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7400711) 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 3 ways as a sum of consecutive naturals, for example, 1233451 + ... + 1233456.

It is an arithmetic number, because the mean of its divisors is an integer number (2466908).

Almost surely, 2^7400721 is an apocalyptic number.

It is an amenable number.

7400721 is a deficient number, since it is larger than the sum of its proper divisors (2466911).

7400721 is a wasteful number, since it uses less digits than its factorization.

7400721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2466910.

The product of its (nonzero) digits is 392, while the sum is 21.

The square root of 7400721 is about 2720.4266209549. The cubic root of 7400721 is about 194.8758447022.

Adding to 7400721 its reverse (1270047), we get a palindrome (8670768).

The spelling of 7400721 in words is "seven million, four hundred thousand, seven hundred twenty-one".