2521816 has 16 divisors (see below), whose sum is σ = 5158440. Its totient is φ = 1146240.

The previous prime is 2521807. The next prime is 2521817. The reversal of 2521816 is 6181252.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2521817) 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, 14241 + ... + 14416.

2^2521816 is an apocalyptic number.

It is an amenable number.

2521816 is an abundant number, since it is smaller than the sum of its proper divisors (2636624).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2521816 is a wasteful number, since it uses less digits than its factorization.

2521816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28674 (or 28670 counting only the distinct ones).

The product of its digits is 960, while the sum is 25.

The square root of 2521816 is about 1588.0226698634. The cubic root of 2521816 is about 136.1145229126.

The spelling of 2521816 in words is "two million, five hundred twenty-one thousand, eight hundred sixteen".