3440640 has 128 divisors (see below), whose sum is σ = 12582720. Its totient is φ = 786432.

The previous prime is 3440627. The next prime is 3440663. The reversal of 3440640 is 460443.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 491517 + ... + 491523.

Almost surely, 2^3440640 is an apocalyptic number.

3440640 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 3440640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6291360).

3440640 is an abundant number, since it is smaller than the sum of its proper divisors (9142080).

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

3440640 is an frugal number, since it uses more digits than its factorization.

3440640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45 (or 17 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 3440640 is about 1854.8962235122. The cubic root of 3440640 is about 150.9662073701.

The spelling of 3440640 in words is "three million, four hundred forty thousand, six hundred forty".