440206640 has 20 divisors (see below), whose sum is σ = 1023480624. Its totient is φ = 176082624.

The previous prime is 440206633. The next prime is 440206651. The reversal of 440206640 is 46602044.

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2751212 + ... + 2751371.

Almost surely, 2^440206640 is an apocalyptic number.

440206640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

440206640 is an abundant number, since it is smaller than the sum of its proper divisors (583273984).

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

440206640 is a wasteful number, since it uses less digits than its factorization.

440206640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5502596 (or 5502590 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 26.

The square root of 440206640 is about 20981.1019729661. The cubic root of 440206640 is about 760.7095405021.

Adding to 440206640 its reverse (46602044), we get a palindrome (486808684).

The spelling of 440206640 in words is "four hundred forty million, two hundred six thousand, six hundred forty".