4013859985444 has 27 divisors (see below), whose sum is σ = 7049102109553. Its totient is φ = 1999855768400.

The previous prime is 4013859985403. The next prime is 4013859985633. The reversal of 4013859985444 is 4445899583104.

The square root of 4013859985444 is 2003462.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 3096325891044 + 917534094400 = 1759638^2 + 957880^2 .

It is a super-2 number, since 2×4013859985444² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1246151754 + ... + 1246154974.

Almost surely, 2^{4013859985444} is an apocalyptic number.

4013859985444 is the 2003462-nd square number.

It is an amenable number.

4013859985444 is a deficient number, since it is larger than the sum of its proper divisors (3035242124109).

4013859985444 is an frugal number, since it uses more digits than its factorization.

4013859985444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7068 (or 3534 counting only the distinct ones).

The product of its (nonzero) digits is 99532800, while the sum is 64.

Multiplying 4013859985444 by its sum of digits (64), we get a square (256887039068416 = 16027696²).

The spelling of 4013859985444 in words is "four trillion, thirteen billion, eight hundred fifty-nine million, nine hundred eighty-five thousand, four hundred forty-four".