6440442 has 32 divisors (see below), whose sum is σ = 13457472. Its totient is φ = 2052864.

The previous prime is 6440431. The next prime is 6440443. The reversal of 6440442 is 2440446.

It is not an unprimeable number, because it can be changed into a prime (6440443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14658 + ... + 15090.

It is an arithmetic number, because the mean of its divisors is an integer number (420546).

Almost surely, 2^6440442 is an apocalyptic number.

6440442 is an abundant number, since it is smaller than the sum of its proper divisors (7017030).

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

6440442 is a wasteful number, since it uses less digits than its factorization.

6440442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542.

The product of its (nonzero) digits is 3072, while the sum is 24.

The square root of 6440442 is about 2537.8025927956. The cubic root of 6440442 is about 186.0538056847.

Adding to 6440442 its reverse (2440446), we get a palindrome (8880888).

It can be divided in two parts, 64404 and 42, that added together give a palindrome (64446).

The spelling of 6440442 in words is "six million, four hundred forty thousand, four hundred forty-two".