7475221 has 8 divisors (see below), whose sum is σ = 8268344. Its totient is φ = 6713280.

The previous prime is 7475213. The next prime is 7475233. The reversal of 7475221 is 1225747.

It can be written as a sum of positive squares in 4 ways, for example, as 2208196 + 5267025 = 1486^2 + 2295^2 .

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

It is not a de Polignac number, because 7475221 - 2³ = 7475213 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7475221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7475201) 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, 7290 + ... + 8251.

It is an arithmetic number, because the mean of its divisors is an integer number (1033543).

Almost surely, 2^7475221 is an apocalyptic number.

It is an amenable number.

7475221 is a deficient number, since it is larger than the sum of its proper divisors (793123).

7475221 is a wasteful number, since it uses less digits than its factorization.

7475221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15591.

The product of its digits is 3920, while the sum is 28.

The square root of 7475221 is about 2734.0850389116. The cubic root of 7475221 is about 195.5275742051.

The spelling of 7475221 in words is "seven million, four hundred seventy-five thousand, two hundred twenty-one".