2781279 has 6 divisors (see below), whose sum is σ = 4017416. Its totient is φ = 1854180.

The previous prime is 2781271. The next prime is 2781293. The reversal of 2781279 is 9721872.

It is not a de Polignac number, because 2781279 - 2³ = 2781271 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2781271) 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, 154507 + ... + 154524.

2^2781279 is an apocalyptic number.

2781279 is a deficient number, since it is larger than the sum of its proper divisors (1236137).

2781279 is a wasteful number, since it uses less digits than its factorization.

2781279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309037 (or 309034 counting only the distinct ones).

The product of its digits is 14112, while the sum is 36.

The square root of 2781279 is about 1667.7167025607. The cubic root of 2781279 is about 140.6311469906.

The spelling of 2781279 in words is "two million, seven hundred eighty-one thousand, two hundred seventy-nine".