18838861 has 8 divisors (see below), whose sum is σ = 19874880. Its totient is φ = 17807328.

The previous prime is 18838847. The next prime is 18838889. The reversal of 18838861 is 16883881.

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

It is a cyclic number.

It is not a de Polignac number, because 18838861 - 2⁵ = 18838829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18838801) 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, 10920 + ... + 12526.

It is an arithmetic number, because the mean of its divisors is an integer number (2484360).

Almost surely, 2^18838861 is an apocalyptic number.

It is an amenable number.

18838861 is a deficient number, since it is larger than the sum of its proper divisors (1036019).

18838861 is a wasteful number, since it uses less digits than its factorization.

18838861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2243.

The product of its digits is 73728, while the sum is 43.

The square root of 18838861 is about 4340.3756749848. The cubic root of 18838861 is about 266.0836650533.

The spelling of 18838861 in words is "eighteen million, eight hundred thirty-eight thousand, eight hundred sixty-one".