3994869646089 has 27 divisors (see below), whose sum is σ = 6712538571687. Its totient is φ = 2282758670304.

The previous prime is 3994869646039. The next prime is 3994869646123. The reversal of 3994869646089 is 9806469684993.

The square root of 3994869646089 is 1998717.

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

3994869646089 is a `hidden beast` number, since 3 + 9 + 9 + 486 + 96 + 46 + 0 + 8 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 3083975015625 + 910894630464 = 1756125^2 + 954408^2 .

It is not a de Polignac number, because 3994869646089 - 2²⁷ = 3994735428361 is a prime.

It is a super-2 number, since 2×3994869646089² (a number of 26 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 3994869645999 and 3994869646017.

It is not an unprimeable number, because it can be changed into a prime (3994869646039) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 41925469 + ... + 42020645.

Almost surely, 2^{3994869646089} is an apocalyptic number.

3994869646089 is the 1998717-th square number.

3994869646089 is the 999359-th centered octagonal number.

It is an amenable number.

3994869646089 is a deficient number, since it is larger than the sum of its proper divisors (2717668925598).

3994869646089 is an frugal number, since it uses more digits than its factorization.

3994869646089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190374 (or 95187 counting only the distinct ones).

The product of its (nonzero) digits is 4353564672, while the sum is 81.

Multiplying 3994869646089 by its sum of digits (81), we get a square (323584441333209 = 17988453²).

The spelling of 3994869646089 in words is "three trillion, nine hundred ninety-four billion, eight hundred sixty-nine million, six hundred forty-six thousand, eighty-nine".