7221290 has 32 divisors (see below), whose sum is σ = 13830480. Its totient is φ = 2709504.

The previous prime is 7221283. The next prime is 7221293. The reversal of 7221290 is 921227.

It can be written as a sum of positive squares in 8 ways, for example, as 4190209 + 3031081 = 2047^2 + 1741^2 .

It is not an unprimeable number, because it can be changed into a prime (7221293) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10394 + ... + 11066.

Almost surely, 2^7221290 is an apocalyptic number.

7221290 is a deficient number, since it is larger than the sum of its proper divisors (6609190).

7221290 is a wasteful number, since it uses less digits than its factorization.

7221290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 746.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 7221290 is about 2687.2458019318. The cubic root of 7221290 is about 193.2880161985.

The spelling of 7221290 in words is "seven million, two hundred twenty-one thousand, two hundred ninety".