440620021656 has 48 divisors (see below), whose sum is σ = 1193376515760. Its totient is φ = 146869571520.

The previous prime is 440620021649. The next prime is 440620021661. The reversal of 440620021656 is 656120026044.

440620021656 is a `hidden beast` number, since 4 + 4 + 0 + 620 + 0 + 21 + 6 + 5 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 440620021656.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5122701 + ... + 5208003.

It is an arithmetic number, because the mean of its divisors is an integer number (24862010745).

Almost surely, 2^440620021656 is an apocalyptic number.

It is an amenable number.

440620021656 is an abundant number, since it is smaller than the sum of its proper divisors (752756494104).

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

440620021656 is a wasteful number, since it uses less digits than its factorization.

440620021656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157056 (or 157049 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The spelling of 440620021656 in words is "four hundred forty billion, six hundred twenty million, twenty-one thousand, six hundred fifty-six".