7221842 has 4 divisors (see below), whose sum is σ = 10832766. Its totient is φ = 3610920.

The previous prime is 7221829. The next prime is 7221847. The reversal of 7221842 is 2481227.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2481227 = 7 ⋅354461.

It can be written as a sum of positive squares in only one way, i.e., 5058001 + 2163841 = 2249^2 + 1471^2 .

It is not an unprimeable number, because it can be changed into a prime (7221847) by changing a digit.

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, 1805459 + ... + 1805462.

Almost surely, 2^7221842 is an apocalyptic number.

7221842 is a deficient number, since it is larger than the sum of its proper divisors (3610924).

7221842 is a wasteful number, since it uses less digits than its factorization.

7221842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3610923.

The product of its digits is 1792, while the sum is 26.

The square root of 7221842 is about 2687.3485073581. The cubic root of 7221842 is about 193.2929410926.

The spelling of 7221842 in words is "seven million, two hundred twenty-one thousand, eight hundred forty-two".