440257405640 has 32 divisors (see below), whose sum is σ = 1066777561080. Its totient is φ = 162556580352.

The previous prime is 440257405639. The next prime is 440257405649. The reversal of 440257405640 is 46504752044.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 375031310404 + 65226095236 = 612398^2 + 255394^2 .

It is not an unprimeable number, because it can be changed into a prime (440257405649) 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, 423323909 + ... + 423324948.

Almost surely, 2^440257405640 is an apocalyptic number.

440257405640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

440257405640 is an abundant number, since it is smaller than the sum of its proper divisors (626520155440).

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

440257405640 is a wasteful number, since it uses less digits than its factorization.

440257405640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 846648881 (or 846648877 counting only the distinct ones).

The product of its (nonzero) digits is 537600, while the sum is 41.

The spelling of 440257405640 in words is "four hundred forty billion, two hundred fifty-seven million, four hundred five thousand, six hundred forty".