18381036 has 24 divisors (see below), whose sum is σ = 43699824. Its totient is φ = 6011200.

The previous prime is 18381031. The next prime is 18381049. The reversal of 18381036 is 63018381.

It is an alternating number because its digits alternate between odd and even.

It is a junction number, because it is equal to n+sod(n) for n = 18380994 and 18381012.

It is not an unprimeable number, because it can be changed into a prime (18381031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13815 + ... + 15086.

It is an arithmetic number, because the mean of its divisors is an integer number (1820826).

Almost surely, 2^18381036 is an apocalyptic number.

It is an amenable number.

18381036 is an abundant number, since it is smaller than the sum of its proper divisors (25318788).

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

18381036 is a wasteful number, since it uses less digits than its factorization.

18381036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28961 (or 28959 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 18381036 is about 4287.3110453990. The cubic root of 18381036 is about 263.9104953701.

The spelling of 18381036 in words is "eighteen million, three hundred eighty-one thousand, thirty-six".