2821279 has 4 divisors (see below), whose sum is σ = 2912320. Its totient is φ = 2730240.

The previous prime is 2821277. The next prime is 2821289. The reversal of 2821279 is 9721282.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2821279 - 2¹ = 2821277 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 91009 = 2821279 / (2 + 8 + 2 + 1 + 2 + 7 + 9).

It is an Ulam number.

It is a Duffinian number.

2821279 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 2821279.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2821277) 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, 45474 + ... + 45535.

It is an arithmetic number, because the mean of its divisors is an integer number (728080).

2^2821279 is an apocalyptic number.

2821279 is a deficient number, since it is larger than the sum of its proper divisors (91041).

2821279 is an equidigital number, since it uses as much as digits as its factorization.

2821279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91040.

The product of its digits is 4032, while the sum is 31.

The square root of 2821279 is about 1679.6663359132. Note that the first 3 decimals coincide. The cubic root of 2821279 is about 141.3021203223.

The spelling of 2821279 in words is "two million, eight hundred twenty-one thousand, two hundred seventy-nine".