18012276 has 18 divisors (see below), whose sum is σ = 45531122. Its totient is φ = 6004080.

The previous prime is 18012259. The next prime is 18012307. The reversal of 18012276 is 67221081.

It can be written as a sum of positive squares in only one way, i.e., 15210000 + 2802276 = 3900^2 + 1674^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 250135 + ... + 250206.

Almost surely, 2^18012276 is an apocalyptic number.

It is an amenable number.

18012276 is an abundant number, since it is smaller than the sum of its proper divisors (27518846).

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

18012276 is a wasteful number, since it uses less digits than its factorization.

18012276 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 500351 (or 500346 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 18012276 is about 4244.0871810084. The cubic root of 18012276 is about 262.1337040696.

The spelling of 18012276 in words is "eighteen million, twelve thousand, two hundred seventy-six".