6209440 has 36 divisors (see below), whose sum is σ = 14744646. Its totient is φ = 2471168.

The previous prime is 6209431. The next prime is 6209443. The reversal of 6209440 is 449026.

6209440 = T₁₄ + T₁₅ + ... + T₃₃₃.

It can be written as a sum of positive squares in 3 ways, for example, as 6012304 + 197136 = 2452^2 + 444^2 .

It is a super-2 number, since 2×6209440² = 77114290227200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6209443) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 31422 + ... + 31618.

Almost surely, 2^6209440 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 6209440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7372323).

6209440 is an abundant number, since it is smaller than the sum of its proper divisors (8535206).

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

6209440 is an equidigital number, since it uses as much as digits as its factorization.

6209440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409 (or 204 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 6209440 is about 2491.8747962127. The cubic root of 6209440 is about 183.8022450048.

The spelling of 6209440 in words is "six million, two hundred nine thousand, four hundred forty".