7499221 has 4 divisors (see below), whose sum is σ = 7526572. Its totient is φ = 7471872.

The previous prime is 7499209. The next prime is 7499231. The reversal of 7499221 is 1229947.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1229947 = 647 ⋅1901.

It can be written as a sum of positive squares in 2 ways, for example, as 2436721 + 5062500 = 1561^2 + 2250^2 .

It is a cyclic number.

It is not a de Polignac number, because 7499221 - 2¹⁵ = 7466453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7499201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13260 + ... + 13813.

It is an arithmetic number, because the mean of its divisors is an integer number (1881643).

Almost surely, 2^7499221 is an apocalyptic number.

It is an amenable number.

7499221 is a deficient number, since it is larger than the sum of its proper divisors (27351).

7499221 is a wasteful number, since it uses less digits than its factorization.

7499221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27350.

The product of its digits is 9072, while the sum is 34.

The square root of 7499221 is about 2738.4705585418. The cubic root of 7499221 is about 195.7366047529.

The spelling of 7499221 in words is "seven million, four hundred ninety-nine thousand, two hundred twenty-one".