6440346 has 36 divisors (see below), whose sum is σ = 15343146. Its totient is φ = 1950960.

The previous prime is 6440341. The next prime is 6440351. The reversal of 6440346 is 6430446.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (6440341) and next prime (6440351).

It can be written as a sum of positive squares in only one way, i.e., 6125625 + 314721 = 2475^2 + 561^2 .

It is not an unprimeable number, because it can be changed into a prime (6440341) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 700 + ... + 3656.

Almost surely, 2^6440346 is an apocalyptic number.

6440346 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 6440346, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7671573).

6440346 is an abundant number, since it is smaller than the sum of its proper divisors (8902800).

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

6440346 is a wasteful number, since it uses less digits than its factorization.

6440346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2987 (or 2973 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

The square root of 6440346 is about 2537.7836787244. The cubic root of 6440346 is about 186.0528812526.

It can be divided in two parts, 6440 and 346, that added together give a triangular number (6786 = T₁₁₆).

The spelling of 6440346 in words is "six million, four hundred forty thousand, three hundred forty-six".