18443772 has 36 divisors (see below), whose sum is σ = 46757256. Its totient is φ = 6130080.

The previous prime is 18443767. The next prime is 18443773. The reversal of 18443772 is 27734481.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18443773) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19003 + ... + 19949.

Almost surely, 2^18443772 is an apocalyptic number.

18443772 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18443772 is an abundant number, since it is smaller than the sum of its proper divisors (28313484).

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

18443772 is a wasteful number, since it uses less digits than its factorization.

18443772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1498 (or 1493 counting only the distinct ones).

The product of its digits is 37632, while the sum is 36.

The square root of 18443772 is about 4294.6212871451. The cubic root of 18443772 is about 264.2104038922.

It can be divided in two parts, 184 and 43772, that added together give a triangular number (43956 = T₂₉₆).

The spelling of 18443772 in words is "eighteen million, four hundred forty-three thousand, seven hundred seventy-two".