3212840 has 32 divisors (see below), whose sum is σ = 7464960. Its totient is φ = 1243200.

The previous prime is 3212819. The next prime is 3212849. The reversal of 3212840 is 482123.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (3212849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56 + ... + 2535.

It is an arithmetic number, because the mean of its divisors is an integer number (233280).

Almost surely, 2^3212840 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 3212840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3732480).

3212840 is an abundant number, since it is smaller than the sum of its proper divisors (4252120).

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

3212840 is a wasteful number, since it uses less digits than its factorization.

3212840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2633 (or 2629 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 3212840 is about 1792.4396782040. The cubic root of 3212840 is about 147.5580926014.

Adding to 3212840 its reverse (482123), we get a palindrome (3694963).

The spelling of 3212840 in words is "three million, two hundred twelve thousand, eight hundred forty".