2818861 has 4 divisors (see below), whose sum is σ = 2909824. Its totient is φ = 2727900.

The previous prime is 2818853. The next prime is 2818867. The reversal of 2818861 is 1688182.

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.

It is a cyclic number.

It is not a de Polignac number, because 2818861 - 2³ = 2818853 is a prime.

It is a Duffinian number.

2818861 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2818867) 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, 45435 + ... + 45496.

It is an arithmetic number, because the mean of its divisors is an integer number (727456).

2^2818861 is an apocalyptic number.

It is an amenable number.

2818861 is a deficient number, since it is larger than the sum of its proper divisors (90963).

2818861 is an equidigital number, since it uses as much as digits as its factorization.

2818861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90962.

The product of its digits is 6144, while the sum is 34.

The square root of 2818861 is about 1678.9463958090. The cubic root of 2818861 is about 141.2617407423.

The spelling of 2818861 in words is "two million, eight hundred eighteen thousand, eight hundred sixty-one".