7221986 has 16 divisors (see below), whose sum is σ = 11483640. Its totient is φ = 3400320.

The previous prime is 7221983. The next prime is 7222001. The reversal of 7221986 is 6891227.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 5736025 + 1485961 = 2395^2 + 1219^2 .

It is a super-3 number, since 3×7221986³ (a number of 22 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7221983) 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, 860 + ... + 3896.

Almost surely, 2^7221986 is an apocalyptic number.

7221986 is a deficient number, since it is larger than the sum of its proper divisors (4261654).

7221986 is a wasteful number, since it uses less digits than its factorization.

7221986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3109.

The product of its digits is 12096, while the sum is 35.

The square root of 7221986 is about 2687.3752994325. The cubic root of 7221986 is about 193.2942258063.

The spelling of 7221986 in words is "seven million, two hundred twenty-one thousand, nine hundred eighty-six".