2921816 has 16 divisors (see below), whose sum is σ = 5627040. Its totient is φ = 1421280.

The previous prime is 2921777. The next prime is 2921819. The reversal of 2921816 is 6181292.

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 (2921819) 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, 4640 + ... + 5231.

It is an arithmetic number, because the mean of its divisors is an integer number (351690).

2^2921816 is an apocalyptic number.

It is an amenable number.

2921816 is a deficient number, since it is larger than the sum of its proper divisors (2705224).

2921816 is a wasteful number, since it uses less digits than its factorization.

2921816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9914 (or 9910 counting only the distinct ones).

The product of its digits is 1728, while the sum is 29.

The square root of 2921816 is about 1709.3320332808. The cubic root of 2921816 is about 142.9610143614.

The spelling of 2921816 in words is "two million, nine hundred twenty-one thousand, eight hundred sixteen".