18228742 has 16 divisors (see below), whose sum is σ = 32608512. Its totient is φ = 7472520.

The previous prime is 18228703. The next prime is 18228797. The reversal of 18228742 is 24782281.

It is a junction number, because it is equal to n+sod(n) for n = 18228698 and 18228707.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27984 + ... + 28627.

It is an arithmetic number, because the mean of its divisors is an integer number (2038032).

Almost surely, 2^18228742 is an apocalyptic number.

18228742 is a deficient number, since it is larger than the sum of its proper divisors (14379770).

18228742 is a wasteful number, since it uses less digits than its factorization.

18228742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56643.

The product of its digits is 14336, while the sum is 34.

The square root of 18228742 is about 4269.5130869925. The cubic root of 18228742 is about 263.1796061932.

It can be divided in two parts, 182287 and 42, that added together give a square (182329 = 427²).

The spelling of 18228742 in words is "eighteen million, two hundred twenty-eight thousand, seven hundred forty-two".