18444490 has 16 divisors (see below), whose sum is σ = 35153352. Its totient is φ = 6943744.

The previous prime is 18444469. The next prime is 18444511. The reversal of 18444490 is 9444481.

It is an interprime number because it is at equal distance from previous prime (18444469) and next prime (18444511).

It can be written as a sum of positive squares in 4 ways, for example, as 18429849 + 14641 = 4293^2 + 121^2 .

It is a super-2 number, since 2×18444490² = 680398422720200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (34).

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 in 7 ways as a sum of consecutive naturals, for example, 54079 + ... + 54418.

Almost surely, 2^18444490 is an apocalyptic number.

18444490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18444490 is a deficient number, since it is larger than the sum of its proper divisors (16708862).

18444490 is a wasteful number, since it uses less digits than its factorization.

18444490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108521.

The product of its (nonzero) digits is 18432, while the sum is 34.

The square root of 18444490 is about 4294.7048792670. The cubic root of 18444490 is about 264.2138323414.

Subtracting from 18444490 its reverse (9444481), we obtain a palindrome (9000009).

The spelling of 18444490 in words is "eighteen million, four hundred forty-four thousand, four hundred ninety".