7408721 has 4 divisors (see below), whose sum is σ = 7647744. Its totient is φ = 7169700.

The previous prime is 7408703. The next prime is 7408733. The reversal of 7408721 is 1278047.

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 a cyclic number.

It is not a de Polignac number, because 7408721 - 2²² = 3214417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7408781) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 119465 + ... + 119526.

It is an arithmetic number, because the mean of its divisors is an integer number (1911936).

Almost surely, 2^7408721 is an apocalyptic number.

It is an amenable number.

7408721 is a deficient number, since it is larger than the sum of its proper divisors (239023).

7408721 is a wasteful number, since it uses less digits than its factorization.

7408721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239022.

The product of its (nonzero) digits is 3136, while the sum is 29.

The square root of 7408721 is about 2721.8965814299. The cubic root of 7408721 is about 194.9460381039.

The spelling of 7408721 in words is "seven million, four hundred eight thousand, seven hundred twenty-one".