6440437 has 8 divisors (see below), whose sum is σ = 6785856. Its totient is φ = 6100512.

The previous prime is 6440431. The next prime is 6440443. The reversal of 6440437 is 7340446.

It is an interprime number because it is at equal distance from previous prime (6440431) and next prime (6440443).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6440437 - 2³ = 6440429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6440431) 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, 1153 + ... + 3769.

It is an arithmetic number, because the mean of its divisors is an integer number (848232).

Almost surely, 2^6440437 is an apocalyptic number.

It is an amenable number.

6440437 is a deficient number, since it is larger than the sum of its proper divisors (345419).

6440437 is a wasteful number, since it uses less digits than its factorization.

6440437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2747.

The product of its (nonzero) digits is 8064, while the sum is 28.

The square root of 6440437 is about 2537.8016076912. The cubic root of 6440437 is about 186.0537575374.

Subtracting 6440437 from its reverse (7340446), we obtain a palindrome (900009).

The spelling of 6440437 in words is "six million, four hundred forty thousand, four hundred thirty-seven".