2788521 has 4 divisors (see below), whose sum is σ = 3718032. Its totient is φ = 1859012.

The previous prime is 2788483. The next prime is 2788523. The reversal of 2788521 is 1258872.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2788521 - 2⁷ = 2788393 is a prime.

It is a D-number.

2788521 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2788523) 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, 464751 + ... + 464756.

It is an arithmetic number, because the mean of its divisors is an integer number (929508).

2^2788521 is an apocalyptic number.

It is an amenable number.

2788521 is a deficient number, since it is larger than the sum of its proper divisors (929511).

2788521 is an equidigital number, since it uses as much as digits as its factorization.

2788521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 929510.

The product of its digits is 8960, while the sum is 33.

The square root of 2788521 is about 1669.8865230907. The cubic root of 2788521 is about 140.7531014442.

It can be divided in two parts, 27885 and 21, that multiplied together give a palindrome (585585).

The spelling of 2788521 in words is "two million, seven hundred eighty-eight thousand, five hundred twenty-one".