7221006 has 24 divisors (see below), whose sum is σ = 16849560. Its totient is φ = 2221776.

The previous prime is 7220999. The next prime is 7221013. The reversal of 7221006 is 6001227.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (7220999) and next prime (7221013).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 7221006.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 15196 + ... + 15663.

It is an arithmetic number, because the mean of its divisors is an integer number (702065).

Almost surely, 2^7221006 is an apocalyptic number.

7221006 is an abundant number, since it is smaller than the sum of its proper divisors (9628554).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7221006 is a wasteful number, since it uses less digits than its factorization.

7221006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30880 (or 30877 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 7221006 is about 2687.1929592048. The cubic root of 7221006 is about 193.2854822783.

It can be divided in two parts, 722 and 1006, that added together give a cube (1728 = 12³).

The spelling of 7221006 in words is "seven million, two hundred twenty-one thousand, six".