3109440 has 112 divisors (see below), whose sum is σ = 10241280. Its totient is φ = 798720.

The previous prime is 3109427. The next prime is 3109441. The reversal of 3109440 is 449013.

It is a super-2 number, since 2×3109440² = 19337234227200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (3109441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39321 + ... + 39399.

It is an arithmetic number, because the mean of its divisors is an integer number (91440).

Almost surely, 2^3109440 is an apocalyptic number.

3109440 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 3109440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5120640).

3109440 is an abundant number, since it is smaller than the sum of its proper divisors (7131840).

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

3109440 is a wasteful number, since it uses less digits than its factorization.

3109440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140 (or 130 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 3109440 is about 1763.3604282732. The cubic root of 3109440 is about 145.9578285658.

The spelling of 3109440 in words is "three million, one hundred nine thousand, four hundred forty".