440400646 has 16 divisors (see below), whose sum is σ = 765607680. Its totient is φ = 186084360.

The previous prime is 440400643. The next prime is 440400671. The reversal of 440400646 is 646004044.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (440400643) 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, 220536 + ... + 222523.

It is an arithmetic number, because the mean of its divisors is an integer number (47850480).

Almost surely, 2^440400646 is an apocalyptic number.

440400646 is a deficient number, since it is larger than the sum of its proper divisors (325207034).

440400646 is a wasteful number, since it uses less digits than its factorization.

440400646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443139.

The product of its (nonzero) digits is 9216, while the sum is 28.

The square root of 440400646 is about 20985.7248147401. The cubic root of 440400646 is about 760.8212763146.

The spelling of 440400646 in words is "four hundred forty million, four hundred thousand, six hundred forty-six".