18861017 has 8 divisors (see below), whose sum is σ = 21909312. Its totient is φ = 15901200.

The previous prime is 18860999. The next prime is 18861019. The reversal of 18861017 is 71016881.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18861017 - 2⁸ = 18860761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18861019) 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, 21659 + ... + 22512.

It is an arithmetic number, because the mean of its divisors is an integer number (2738664).

Almost surely, 2^18861017 is an apocalyptic number.

It is an amenable number.

18861017 is a deficient number, since it is larger than the sum of its proper divisors (3048295).

18861017 is an equidigital number, since it uses as much as digits as its factorization.

18861017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44239.

The product of its (nonzero) digits is 2688, while the sum is 32.

The square root of 18861017 is about 4342.9272386260. The cubic root of 18861017 is about 266.1879360433.

Adding to 18861017 its reverse (71016881), we get a palindrome (89877898).

The spelling of 18861017 in words is "eighteen million, eight hundred sixty-one thousand, seventeen".