3198640 has 20 divisors (see below), whose sum is σ = 7437024. Its totient is φ = 1279424.

The previous prime is 3198619. The next prime is 3198649. The reversal of 3198640 is 468913.

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (3198649) 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, 19912 + ... + 20071.

Almost surely, 2^3198640 is an apocalyptic number.

It is an amenable number.

3198640 is an abundant number, since it is smaller than the sum of its proper divisors (4238384).

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

3198640 is a wasteful number, since it uses less digits than its factorization.

3198640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39996 (or 39990 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 3198640 is about 1788.4742100461. The cubic root of 3198640 is about 147.3403808090.

The spelling of 3198640 in words is "three million, one hundred ninety-eight thousand, six hundred forty".