7221947 has 4 divisors (see below), whose sum is σ = 7227360. Its totient is φ = 7216536.

The previous prime is 7221937. The next prime is 7221953. The reversal of 7221947 is 7491227.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 7221947 - 2¹⁴ = 7205563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7221917) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 878 + ... + 3900.

It is an arithmetic number, because the mean of its divisors is an integer number (1806840).

Almost surely, 2^7221947 is an apocalyptic number.

7221947 is a deficient number, since it is larger than the sum of its proper divisors (5413).

7221947 is a wasteful number, since it uses less digits than its factorization.

7221947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5412.

The product of its digits is 7056, while the sum is 32.

The square root of 7221947 is about 2687.3680432721. The cubic root of 7221947 is about 193.2938778647.

The spelling of 7221947 in words is "seven million, two hundred twenty-one thousand, nine hundred forty-seven".