1933638109 has 4 divisors (see below), whose sum is σ = 2082379516. Its totient is φ = 1784896704.

The previous prime is 1933638107. The next prime is 1933638143. The reversal of 1933638109 is 9018363391.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 727812484 + 1205825625 = 26978^2 + 34725^2 .

It is a cyclic number.

It is not a de Polignac number, because 1933638109 - 2¹ = 1933638107 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1933638103) 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, 74370684 + ... + 74370709.

It is an arithmetic number, because the mean of its divisors is an integer number (520594879).

Almost surely, 2^1933638109 is an apocalyptic number.

It is an amenable number.

1933638109 is a deficient number, since it is larger than the sum of its proper divisors (148741407).

1933638109 is a wasteful number, since it uses less digits than its factorization.

1933638109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148741406.

The product of its (nonzero) digits is 104976, while the sum is 43.

The square root of 1933638109 is about 43973.1521385493. The cubic root of 1933638109 is about 1245.8288935650.

The spelling of 1933638109 in words is "one billion, nine hundred thirty-three million, six hundred thirty-eight thousand, one hundred nine".