2789881 has 2 divisors, whose sum is σ = 2789882. Its totient is φ = 2789880.

The previous prime is 2789861. The next prime is 2789893. The reversal of 2789881 is 1889872.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1904400 + 885481 = 1380^2 + 941^2 .

It is a cyclic number.

It is not a de Polignac number, because 2789881 - 2⁵ = 2789849 is a prime.

It is a super-2 number, since 2×2789881² = 15566871988322, which contains 22 as substring.

2789881 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (2789821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1394940 + 1394941.

It is an arithmetic number, because the mean of its divisors is an integer number (1394941).

2^2789881 is an apocalyptic number.

It is an amenable number.

2789881 is a deficient number, since it is larger than the sum of its proper divisors (1).

2789881 is an equidigital number, since it uses as much as digits as its factorization.

2789881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64512, while the sum is 43.

The square root of 2789881 is about 1670.2936867509. The cubic root of 2789881 is about 140.7759801323.

Subtracting from 2789881 its reverse (1889872), we obtain a palindrome (900009).

The spelling of 2789881 in words is "two million, seven hundred eighty-nine thousand, eight hundred eighty-one".