3921816 has 16 divisors (see below), whose sum is σ = 9804600. Its totient is φ = 1307264.

The previous prime is 3921791. The next prime is 3921817. The reversal of 3921816 is 6181293.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3921817) 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, 81681 + ... + 81728.

Almost surely, 2^3921816 is an apocalyptic number.

It is an amenable number.

3921816 is an abundant number, since it is smaller than the sum of its proper divisors (5882784).

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

3921816 is a wasteful number, since it uses less digits than its factorization.

3921816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163418 (or 163414 counting only the distinct ones).

The product of its digits is 2592, while the sum is 30.

The square root of 3921816 is about 1980.3575434754. The cubic root of 3921816 is about 157.6990479097.

The spelling of 3921816 in words is "three million, nine hundred twenty-one thousand, eight hundred sixteen".