7457921 has 8 divisors (see below), whose sum is σ = 7660224. Its totient is φ = 7258320.

The previous prime is 7457909. The next prime is 7457927. The reversal of 7457921 is 1297547.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7457921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7457927) 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, 5690 + ... + 6876.

It is an arithmetic number, because the mean of its divisors is an integer number (957528).

Almost surely, 2^7457921 is an apocalyptic number.

It is an amenable number.

7457921 is a deficient number, since it is larger than the sum of its proper divisors (202303).

7457921 is a wasteful number, since it uses less digits than its factorization.

7457921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1351.

The product of its digits is 17640, while the sum is 35.

The square root of 7457921 is about 2730.9194422392. The cubic root of 7457921 is about 195.3766203680.

The spelling of 7457921 in words is "seven million, four hundred fifty-seven thousand, nine hundred twenty-one".