440840640 has 56 divisors (see below), whose sum is σ = 1399672080. Its totient is φ = 117557248.

The previous prime is 440840627. The next prime is 440840657. The reversal of 440840640 is 46048044.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 440840598 and 440840607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 228645 + ... + 230564.

Almost surely, 2^440840640 is an apocalyptic number.

440840640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

440840640 is an abundant number, since it is smaller than the sum of its proper divisors (958831440).

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

440840640 is a wasteful number, since it uses less digits than its factorization.

440840640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 459229 (or 459219 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 30.

The square root of 440840640 is about 20996.2053714475. The cubic root of 440840640 is about 761.0745649046.

Adding to 440840640 its reverse (46048044), we get a palindrome (486888684).

The spelling of 440840640 in words is "four hundred forty million, eight hundred forty thousand, six hundred forty".