1818436444 has 12 divisors (see below), whose sum is σ = 3471560568. Its totient is φ = 826562000.

The previous prime is 1818436423. The next prime is 1818436453. The reversal of 1818436444 is 4446348181.

It is a happy number.

It is a super-2 number, since 2×1818436444² = 6613422201734730272, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1818436444.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20664007 + ... + 20664094.

It is an arithmetic number, because the mean of its divisors is an integer number (289296714).

Almost surely, 2^1818436444 is an apocalyptic number.

It is an amenable number.

1818436444 is a deficient number, since it is larger than the sum of its proper divisors (1653124124).

1818436444 is a wasteful number, since it uses less digits than its factorization.

1818436444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41328116 (or 41328114 counting only the distinct ones).

The product of its digits is 294912, while the sum is 43.

The square root of 1818436444 is about 42643.1289189712. The cubic root of 1818436444 is about 1220.5794175072.

The spelling of 1818436444 in words is "one billion, eight hundred eighteen million, four hundred thirty-six thousand, four hundred forty-four".