1994936689 has 4 divisors (see below), whose sum is σ = 2112285924. Its totient is φ = 1877587456.

The previous prime is 1994936653. The next prime is 1994936693. The reversal of 1994936689 is 9866394991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9866394991 = 25601 ⋅385391.

It can be written as a sum of positive squares in 2 ways, for example, as 804686689 + 1190250000 = 28367^2 + 34500^2 .

It is a cyclic number.

It is not a de Polignac number, because 1994936689 - 2¹⁹ = 1994412401 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1994936689.

It is not an unprimeable number, because it can be changed into a prime (1994936089) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58674592 + ... + 58674625.

It is an arithmetic number, because the mean of its divisors is an integer number (528071481).

Almost surely, 2^1994936689 is an apocalyptic number.

It is an amenable number.

1994936689 is a deficient number, since it is larger than the sum of its proper divisors (117349235).

1994936689 is a wasteful number, since it uses less digits than its factorization.

1994936689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117349234.

The product of its digits is 22674816, while the sum is 64.

The square root of 1994936689 is about 44664.7141376725. The cubic root of 1994936689 is about 1258.8569227027.

The spelling of 1994936689 in words is "one billion, nine hundred ninety-four million, nine hundred thirty-six thousand, six hundred eighty-nine".