18289872 has 60 divisors (see below), whose sum is σ = 51575940. Its totient is φ = 6050304.

The previous prime is 18289871. The next prime is 18289879. The reversal of 18289872 is 27898281.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 11128896 + 7160976 = 3336^2 + 2676^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18289871) 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, 22204 + ... + 23012.

It is an arithmetic number, because the mean of its divisors is an integer number (859599).

Almost surely, 2^18289872 is an apocalyptic number.

18289872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18289872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25787970).

18289872 is an abundant number, since it is smaller than the sum of its proper divisors (33286068).

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

18289872 is a wasteful number, since it uses less digits than its factorization.

18289872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 980 (or 971 counting only the distinct ones).

The product of its digits is 129024, while the sum is 45.

The square root of 18289872 is about 4276.6659911665. The cubic root of 18289872 is about 263.4734684702.

The spelling of 18289872 in words is "eighteen million, two hundred eighty-nine thousand, eight hundred seventy-two".