2779881 has 12 divisors (see below), whose sum is σ = 4014288. Its totient is φ = 1710384.

The previous prime is 2779877. The next prime is 2779939. The reversal of 2779881 is 1889772.

It is not a de Polignac number, because 2779881 - 2² = 2779877 is a prime.

It is a super-2 number, since 2×2779881² = 15455476748322, which contains 22 as substring.

It is a nialpdrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (2779811) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2235 + ... + 3248.

It is an arithmetic number, because the mean of its divisors is an integer number (334524).

2^2779881 is an apocalyptic number.

It is an amenable number.

2779881 is a deficient number, since it is larger than the sum of its proper divisors (1234407).

2779881 is a wasteful number, since it uses less digits than its factorization.

2779881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5512 (or 5499 counting only the distinct ones).

The product of its digits is 56448, while the sum is 42.

The square root of 2779881 is about 1667.2975139428. The cubic root of 2779881 is about 140.6075804596.

The spelling of 2779881 in words is "two million, seven hundred seventy-nine thousand, eight hundred eighty-one".