7221493 has 4 divisors (see below), whose sum is σ = 7470540. Its totient is φ = 6972448.

The previous prime is 7221457. The next prime is 7221499. The reversal of 7221493 is 3941227.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3941227 = 19 ⋅207433.

It can be written as a sum of positive squares in 2 ways, for example, as 6185169 + 1036324 = 2487^2 + 1018^2 .

It is a cyclic number.

It is not a de Polignac number, because 7221493 - 2⁹ = 7220981 is a prime.

It is a super-2 number, since 2×7221493² = 104299922298098, which contains 22 as substring.

It is a Duffinian number.

7221493 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7221499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124480 + ... + 124537.

It is an arithmetic number, because the mean of its divisors is an integer number (1867635).

Almost surely, 2^7221493 is an apocalyptic number.

It is an amenable number.

7221493 is a deficient number, since it is larger than the sum of its proper divisors (249047).

7221493 is a wasteful number, since it uses less digits than its factorization.

7221493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249046.

The product of its digits is 3024, while the sum is 28.

The square root of 7221493 is about 2687.2835726808. The cubic root of 7221493 is about 193.2898273753.

The spelling of 7221493 in words is "seven million, two hundred twenty-one thousand, four hundred ninety-three".