2821918 has 32 divisors (see below), whose sum is σ = 5005440. Its totient is φ = 1179360.

The previous prime is 2821913. The next prime is 2821919. The reversal of 2821918 is 8191282.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 2821918.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2821913) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17896 + ... + 18052.

It is an arithmetic number, because the mean of its divisors is an integer number (156420).

2^2821918 is an apocalyptic number.

2821918 is a deficient number, since it is larger than the sum of its proper divisors (2183522).

2821918 is a wasteful number, since it uses less digits than its factorization.

2821918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232.

The product of its digits is 2304, while the sum is 31.

The square root of 2821918 is about 1679.8565414939. The cubic root of 2821918 is about 141.3127874983.

The spelling of 2821918 in words is "two million, eight hundred twenty-one thousand, nine hundred eighteen".