1939691108889 has 24 divisors (see below), whose sum is σ = 2951936524160. Its totient is φ = 1223947120032.

The previous prime is 1939691108863. The next prime is 1939691108891. The reversal of 1939691108889 is 9888011969391.

It is not a de Polignac number, because 1939691108889 - 2¹⁵ = 1939691076121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1939691108809) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5002129 + ... + 5375934.

Almost surely, 2^{1939691108889} is an apocalyptic number.

1939691108889 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1939691108889 is a deficient number, since it is larger than the sum of its proper divisors (1012245415271).

1939691108889 is a wasteful number, since it uses less digits than its factorization.

1939691108889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10379181 (or 10379178 counting only the distinct ones).

The product of its (nonzero) digits is 60466176, while the sum is 72.

The spelling of 1939691108889 in words is "one trillion, nine hundred thirty-nine billion, six hundred ninety-one million, one hundred eight thousand, eight hundred eighty-nine".