7221898 has 4 divisors (see below), whose sum is σ = 10832850. Its totient is φ = 3610948.

The previous prime is 7221871. The next prime is 7221911. The reversal of 7221898 is 8981227.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8981227 = 31 ⋅289717.

It can be written as a sum of positive squares in only one way, i.e., 7198489 + 23409 = 2683^2 + 153^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1805473 + ... + 1805476.

Almost surely, 2^7221898 is an apocalyptic number.

7221898 is a deficient number, since it is larger than the sum of its proper divisors (3610952).

7221898 is a wasteful number, since it uses less digits than its factorization.

7221898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3610951.

The product of its digits is 16128, while the sum is 37.

The square root of 7221898 is about 2687.3589265299. The cubic root of 7221898 is about 193.2934407055.

The spelling of 7221898 in words is "seven million, two hundred twenty-one thousand, eight hundred ninety-eight".