18055784 has 8 divisors (see below), whose sum is σ = 33854610. Its totient is φ = 9027888.

The previous prime is 18055783. The next prime is 18055787. The reversal of 18055784 is 48755081.

It can be written as a sum of positive squares in only one way, i.e., 13853284 + 4202500 = 3722^2 + 2050^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×18055784² = 652022671709312, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18055781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1128479 + ... + 1128494.

Almost surely, 2^18055784 is an apocalyptic number.

It is an amenable number.

18055784 is a deficient number, since it is larger than the sum of its proper divisors (15798826).

18055784 is a wasteful number, since it uses less digits than its factorization.

18055784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2256979 (or 2256975 counting only the distinct ones).

The product of its (nonzero) digits is 44800, while the sum is 38.

The square root of 18055784 is about 4249.2098088939. The cubic root of 18055784 is about 262.3445925174.

The spelling of 18055784 in words is "eighteen million, fifty-five thousand, seven hundred eighty-four".