18844480 has 28 divisors (see below), whose sum is σ = 44874180. Its totient is φ = 7537664.

The previous prime is 18844471. The next prime is 18844489. The reversal of 18844480 is 8444881.

It is an interprime number because it is at equal distance from previous prime (18844471) and next prime (18844489).

It can be written as a sum of positive squares in 2 ways, for example, as 5419584 + 13424896 = 2328^2 + 3664^2 .

It is a super-2 number, since 2×18844480² = 710228852940800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18844489) 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 in 3 ways as a sum of consecutive naturals, for example, 29125 + ... + 29764.

Almost surely, 2^18844480 is an apocalyptic number.

18844480 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18844480 is an abundant number, since it is smaller than the sum of its proper divisors (26029700).

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

18844480 is an equidigital number, since it uses as much as digits as its factorization.

18844480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58906 (or 58896 counting only the distinct ones).

The product of its (nonzero) digits is 32768, while the sum is 37.

The square root of 18844480 is about 4341.0229209254. The cubic root of 18844480 is about 266.1101170327.

The spelling of 18844480 in words is "eighteen million, eight hundred forty-four thousand, four hundred eighty".