18288738 has 24 divisors (see below), whose sum is σ = 42674268. Its totient is φ = 5627232.

The previous prime is 18288733. The next prime is 18288769. The reversal of 18288738 is 83788281.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 13373649 + 4915089 = 3657^2 + 2217^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18288693 and 18288702.

It is not an unprimeable number, because it can be changed into a prime (18288731) 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, 38845 + ... + 39312.

Almost surely, 2^18288738 is an apocalyptic number.

18288738 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18288738 is an abundant number, since it is smaller than the sum of its proper divisors (24385530).

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

18288738 is a wasteful number, since it uses less digits than its factorization.

18288738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78178 (or 78175 counting only the distinct ones).

The product of its digits is 172032, while the sum is 45.

The square root of 18288738 is about 4276.5334091996. The cubic root of 18288738 is about 263.4680231052.

The spelling of 18288738 in words is "eighteen million, two hundred eighty-eight thousand, seven hundred thirty-eight".