18280738 has 16 divisors (see below), whose sum is σ = 32186304. Its totient is φ = 7622640.

The previous prime is 18280727. The next prime is 18280739. The reversal of 18280738 is 83708281.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a junction number, because it is equal to n+sod(n) for n = 18280697 and 18280706.

It is not an unprimeable number, because it can be changed into a prime (18280739) 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 7 ways as a sum of consecutive naturals, for example, 17128 + ... + 18163.

It is an arithmetic number, because the mean of its divisors is an integer number (2011644).

Almost surely, 2^18280738 is an apocalyptic number.

18280738 is a deficient number, since it is larger than the sum of its proper divisors (13905566).

18280738 is a wasteful number, since it uses less digits than its factorization.

18280738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35337.

The product of its (nonzero) digits is 21504, while the sum is 37.

The square root of 18280738 is about 4275.5979698751. The cubic root of 18280738 is about 263.4296014348.

The spelling of 18280738 in words is "eighteen million, two hundred eighty thousand, seven hundred thirty-eight".