3138440 has 32 divisors (see below), whose sum is σ = 7292160. Its totient is φ = 1214400.

The previous prime is 3138403. The next prime is 3138449. The reversal of 3138440 is 448313.

It is not an unprimeable number, because it can be changed into a prime (3138449) 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, 26 + ... + 2505.

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

Almost surely, 2^3138440 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 3138440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3646080).

3138440 is an abundant number, since it is smaller than the sum of its proper divisors (4153720).

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

3138440 is a wasteful number, since it uses less digits than its factorization.

3138440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2573 (or 2569 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 3138440 is about 1771.5642805160. The cubic root of 3138440 is about 146.4101807446.

The spelling of 3138440 in words is "three million, one hundred thirty-eight thousand, four hundred forty".