18481356 has 18 divisors (see below), whose sum is σ = 46716852. Its totient is φ = 6160440.

The previous prime is 18481321. The next prime is 18481369. The reversal of 18481356 is 65318481.

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

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 513371 = 18481356 / (1 + 8 + 4 + 8 + 1 + 3 + 5 + 6).

It is a self number, because there is not a number n which added to its sum of digits gives 18481356.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 256650 + ... + 256721.

Almost surely, 2^18481356 is an apocalyptic number.

It is an amenable number.

18481356 is an abundant number, since it is smaller than the sum of its proper divisors (28235496).

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

18481356 is a wasteful number, since it uses less digits than its factorization.

18481356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 513381 (or 513376 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 18481356 is about 4298.9947662215. The cubic root of 18481356 is about 264.3897480162.

The spelling of 18481356 in words is "eighteen million, four hundred eighty-one thousand, three hundred fifty-six".