7424921 has 8 divisors (see below), whose sum is σ = 8659200. Its totient is φ = 6363924.

The previous prime is 7424909. The next prime is 7424927. The reversal of 7424921 is 1294247.

It is a de Polignac number, because none of the positive numbers 2^k-7424921 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7424927) 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, 10481 + ... + 11166.

It is an arithmetic number, because the mean of its divisors is an integer number (1082400).

Almost surely, 2^7424921 is an apocalyptic number.

It is an amenable number.

7424921 is a deficient number, since it is larger than the sum of its proper divisors (1234279).

7424921 is an equidigital number, since it uses as much as digits as its factorization.

7424921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21668 (or 21654 counting only the distinct ones).

The product of its digits is 4032, while the sum is 29.

The square root of 7424921 is about 2724.8708226263. The cubic root of 7424921 is about 195.0880251281.

The spelling of 7424921 in words is "seven million, four hundred twenty-four thousand, nine hundred twenty-one".