7493921 has 2 divisors, whose sum is σ = 7493922. Its totient is φ = 7493920.

The previous prime is 7493917. The next prime is 7493947. The reversal of 7493921 is 1293947.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7349521 + 144400 = 2711^2 + 380^2 .

It is an emirp because it is prime and its reverse (1293947) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7493921 - 2² = 7493917 is a prime.

It is a super-3 number, since 3×7493921³ (a number of 22 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (7493621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3746960 + 3746961.

It is an arithmetic number, because the mean of its divisors is an integer number (3746961).

Almost surely, 2^7493921 is an apocalyptic number.

It is an amenable number.

7493921 is a deficient number, since it is larger than the sum of its proper divisors (1).

7493921 is an equidigital number, since it uses as much as digits as its factorization.

7493921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13608, while the sum is 35.

The square root of 7493921 is about 2737.5026940626. The cubic root of 7493921 is about 195.6904822515.

The spelling of 7493921 in words is "seven million, four hundred ninety-three thousand, nine hundred twenty-one".