3216840 has 64 divisors (see below), whose sum is σ = 10532160. Its totient is φ = 779520.

The previous prime is 3216827. The next prime is 3216853. The reversal of 3216840 is 486123.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (3216827) and next prime (3216853).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 3216840.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 102 + ... + 2538.

It is an arithmetic number, because the mean of its divisors is an integer number (164565).

Almost surely, 2^3216840 is an apocalyptic number.

3216840 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3216840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5266080).

3216840 is an abundant number, since it is smaller than the sum of its proper divisors (7315320).

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

3216840 is a wasteful number, since it uses less digits than its factorization.

3216840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2462 (or 2458 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 3216840 is about 1793.5551287875. Note that the first 3 decimals coincide. The cubic root of 3216840 is about 147.6193040314.

The spelling of 3216840 in words is "three million, two hundred sixteen thousand, eight hundred forty".