1864439894113 has 16 divisors (see below), whose sum is σ = 1885831009920. Its totient is φ = 1843131024000.

The previous prime is 1864439894111. The next prime is 1864439894123. The reversal of 1864439894113 is 3114989344681.

It is a cyclic number.

It is not a de Polignac number, because 1864439894113 - 2¹ = 1864439894111 is a prime.

It is a super-2 number, since 2×1864439894113² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1864439894111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 104435638 + ... + 104453488.

It is an arithmetic number, because the mean of its divisors is an integer number (117864438120).

Almost surely, 2^{1864439894113} is an apocalyptic number.

It is an amenable number.

1864439894113 is a deficient number, since it is larger than the sum of its proper divisors (21391115807).

1864439894113 is a wasteful number, since it uses less digits than its factorization.

1864439894113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20088.

The product of its digits is 17915904, while the sum is 61.

The spelling of 1864439894113 in words is "one trillion, eight hundred sixty-four billion, four hundred thirty-nine million, eight hundred ninety-four thousand, one hundred thirteen".