3181816 has 48 divisors (see below), whose sum is σ = 6942600. Its totient is φ = 1362240.

The previous prime is 3181813. The next prime is 3181823. The reversal of 3181816 is 6181813.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3181813) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18306 + ... + 18478.

Almost surely, 2^3181816 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3181816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3471300).

3181816 is an abundant number, since it is smaller than the sum of its proper divisors (3760784).

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

3181816 is a wasteful number, since it uses less digits than its factorization.

3181816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220 (or 205 counting only the distinct ones).

The product of its digits is 1152, while the sum is 28.

The square root of 3181816 is about 1783.7645584550. The cubic root of 3181816 is about 147.0816027709.

The spelling of 3181816 in words is "three million, one hundred eighty-one thousand, eight hundred sixteen".