18031768 has 8 divisors (see below), whose sum is σ = 33809580. Its totient is φ = 9015880.

The previous prime is 18031753. The next prime is 18031787. The reversal of 18031768 is 86713081.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1126978 + ... + 1126993.

Almost surely, 2^18031768 is an apocalyptic number.

It is an amenable number.

18031768 is a deficient number, since it is larger than the sum of its proper divisors (15777812).

18031768 is a wasteful number, since it uses less digits than its factorization.

18031768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2253977 (or 2253973 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 18031768 is about 4246.3829313900. The cubic root of 18031768 is about 262.2282260534.

The spelling of 18031768 in words is "eighteen million, thirty-one thousand, seven hundred sixty-eight".