3216440 has 32 divisors (see below), whose sum is σ = 7292160. Its totient is φ = 1276800.

The previous prime is 3216431. The next prime is 3216449. The reversal of 3216440 is 446123.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (3216431) and next prime (3216449).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3216449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7430 + ... + 7850.

It is an arithmetic number, because the mean of its divisors is an integer number (227880).

Almost surely, 2^3216440 is an apocalyptic number.

It is an amenable number.

3216440 is an abundant number, since it is smaller than the sum of its proper divisors (4075720).

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

3216440 is a wasteful number, since it uses less digits than its factorization.

3216440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 623 (or 619 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 3216440 is about 1793.4436149486. The cubic root of 3216440 is about 147.6131851726.

The spelling of 3216440 in words is "three million, two hundred sixteen thousand, four hundred forty".