7221406 has 16 divisors (see below), whose sum is σ = 11797200. Its totient is φ = 3302208.

The previous prime is 7221391. The next prime is 7221439. The reversal of 7221406 is 6041227.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2175 + ... + 4378.

It is an arithmetic number, because the mean of its divisors is an integer number (737325).

Almost surely, 2^7221406 is an apocalyptic number.

7221406 is a deficient number, since it is larger than the sum of its proper divisors (4575794).

7221406 is a wasteful number, since it uses less digits than its factorization.

7221406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6603.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 7221406 is about 2687.2673852819. The cubic root of 7221406 is about 193.2890511608.

The spelling of 7221406 in words is "seven million, two hundred twenty-one thousand, four hundred six".