6440342 has 8 divisors (see below), whose sum is σ = 9714432. Its totient is φ = 3202200.

The previous prime is 6440341. The next prime is 6440351. The reversal of 6440342 is 2430446.

It is a happy number.

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

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 8534 + ... + 9257.

It is an arithmetic number, because the mean of its divisors is an integer number (1214304).

Almost surely, 2^6440342 is an apocalyptic number.

6440342 is a deficient number, since it is larger than the sum of its proper divisors (3274090).

6440342 is a wasteful number, since it uses less digits than its factorization.

6440342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17974.

The product of its (nonzero) digits is 2304, while the sum is 23.

The square root of 6440342 is about 2537.7828906351. The cubic root of 6440342 is about 186.0528427344.

Adding to 6440342 its reverse (2430446), we get a palindrome (8870788).

The spelling of 6440342 in words is "six million, four hundred forty thousand, three hundred forty-two".