7218444 has 24 divisors (see below), whose sum is σ = 16887808. Its totient is φ = 2399760.

The previous prime is 7218439. The next prime is 7218451. The reversal of 7218444 is 4448127.

It is a super-2 number, since 2×7218444² = 104211867562272, which contains 22 as substring.

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, 6789 + ... + 7779.

Almost surely, 2^7218444 is an apocalyptic number.

It is an amenable number.

7218444 is an abundant number, since it is smaller than the sum of its proper divisors (9669364).

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

7218444 is a wasteful number, since it uses less digits than its factorization.

7218444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1605 (or 1603 counting only the distinct ones).

The product of its digits is 7168, while the sum is 30.

The square root of 7218444 is about 2686.7162112884. The cubic root of 7218444 is about 193.2626204600.

The spelling of 7218444 in words is "seven million, two hundred eighteen thousand, four hundred forty-four".