18861841 has 4 divisors (see below), whose sum is σ = 18870592. Its totient is φ = 18853092.

The previous prime is 18861827. The next prime is 18861881. The reversal of 18861841 is 14816881.

18861841 is nontrivially palindromic in base 16.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 18861841 - 2⁵ = 18861809 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18861841.

It is not an unprimeable number, because it can be changed into a prime (18861881) 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, 1396 + ... + 6298.

It is an arithmetic number, because the mean of its divisors is an integer number (4717648).

Almost surely, 2^18861841 is an apocalyptic number.

It is an amenable number.

18861841 is a deficient number, since it is larger than the sum of its proper divisors (8751).

18861841 is an equidigital number, since it uses as much as digits as its factorization.

18861841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8750.

The product of its digits is 12288, while the sum is 37.

The square root of 18861841 is about 4343.0221044798. The cubic root of 18861841 is about 266.1918123925.

The spelling of 18861841 in words is "eighteen million, eight hundred sixty-one thousand, eight hundred forty-one".