18723036 has 24 divisors (see below), whose sum is σ = 44868880. Its totient is φ = 6072192.

The previous prime is 18723013. The next prime is 18723041. The reversal of 18723036 is 63032781.

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 = 18722994 and 18723012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20641 + ... + 21528.

Almost surely, 2^18723036 is an apocalyptic number.

It is an amenable number.

18723036 is an abundant number, since it is smaller than the sum of its proper divisors (26145844).

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

18723036 is a wasteful number, since it uses less digits than its factorization.

18723036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42213 (or 42211 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 18723036 is about 4327.0123642070. The cubic root of 18723036 is about 265.5372321979.

The spelling of 18723036 in words is "eighteen million, seven hundred twenty-three thousand, thirty-six".