7392721 has 8 divisors (see below), whose sum is σ = 8470784. Its totient is φ = 6320160.

The previous prime is 7392719. The next prime is 7392761. The reversal of 7392721 is 1272937.

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

It is not a de Polignac number, because 7392721 - 2¹ = 7392719 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7392701) 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, 2101 + ... + 4381.

It is an arithmetic number, because the mean of its divisors is an integer number (1058848).

Almost surely, 2^7392721 is an apocalyptic number.

It is an amenable number.

7392721 is a deficient number, since it is larger than the sum of its proper divisors (1078063).

7392721 is a wasteful number, since it uses less digits than its factorization.

7392721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2751.

The product of its digits is 5292, while the sum is 31.

The square root of 7392721 is about 2718.9558657691. The cubic root of 7392721 is about 194.8056006974.

The spelling of 7392721 in words is "seven million, three hundred ninety-two thousand, seven hundred twenty-one".