18844861 has 6 divisors (see below), whose sum is σ = 21921630. Its totient is φ = 16152696.

The previous prime is 18844853. The next prime is 18844873. The reversal of 18844861 is 16844881.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 9572836 + 9272025 = 3094^2 + 3045^2 .

It is not a de Polignac number, because 18844861 - 2³ = 18844853 is a prime.

It is a super-2 number, since 2×18844861² = 710257572218642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18844801) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 192246 + ... + 192343.

It is an arithmetic number, because the mean of its divisors is an integer number (3653605).

Almost surely, 2^18844861 is an apocalyptic number.

It is an amenable number.

18844861 is a deficient number, since it is larger than the sum of its proper divisors (3076769).

18844861 is an equidigital number, since it uses as much as digits as its factorization.

18844861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384603 (or 384596 counting only the distinct ones).

The product of its digits is 49152, while the sum is 40.

The square root of 18844861 is about 4341.0668043696. The cubic root of 18844861 is about 266.1119104363. Note that the first 3 decimals are identical.

The spelling of 18844861 in words is "eighteen million, eight hundred forty-four thousand, eight hundred sixty-one".