18861236 has 12 divisors (see below), whose sum is σ = 33378660. Its totient is φ = 9324480.

The previous prime is 18861233. The next prime is 18861247. The reversal of 18861236 is 63216881.

It can be written as a sum of positive squares in 2 ways, for example, as 12888100 + 5973136 = 3590^2 + 2444^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18861196 and 18861205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18861233) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26135 + ... + 26846.

It is an arithmetic number, because the mean of its divisors is an integer number (2781555).

Almost surely, 2^18861236 is an apocalyptic number.

It is an amenable number.

18861236 is a deficient number, since it is larger than the sum of its proper divisors (14517424).

18861236 is a wasteful number, since it uses less digits than its factorization.

18861236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53074 (or 53072 counting only the distinct ones).

The product of its digits is 13824, while the sum is 35.

The square root of 18861236 is about 4342.9524519617. The cubic root of 18861236 is about 266.1889662976.

The spelling of 18861236 in words is "eighteen million, eight hundred sixty-one thousand, two hundred thirty-six".