18561936 has 40 divisors (see below), whose sum is σ = 50477920. Its totient is φ = 5861376.

The previous prime is 18561923. The next prime is 18561941. The reversal of 18561936 is 63916581.

It is a junction number, because it is equal to n+sod(n) for n = 18561894 and 18561903.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9265 + ... + 11088.

It is an arithmetic number, because the mean of its divisors is an integer number (1261948).

Almost surely, 2^18561936 is an apocalyptic number.

18561936 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18561936 is an abundant number, since it is smaller than the sum of its proper divisors (31915984).

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

18561936 is a wasteful number, since it uses less digits than its factorization.

18561936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20383 (or 20377 counting only the distinct ones).

The product of its digits is 38880, while the sum is 39.

The square root of 18561936 is about 4308.3565312077. The cubic root of 18561936 is about 264.7734434840.

The spelling of 18561936 in words is "eighteen million, five hundred sixty-one thousand, nine hundred thirty-six".