1838906689 has 4 divisors (see below), whose sum is σ = 1856760256. Its totient is φ = 1821053124.

The previous prime is 1838906687. The next prime is 1838906717. The reversal of 1838906689 is 9866098381.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1838906689 - 2¹ = 1838906687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1838906681) 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, 8926629 + ... + 8926834.

It is an arithmetic number, because the mean of its divisors is an integer number (464190064).

Almost surely, 2^1838906689 is an apocalyptic number.

It is an amenable number.

1838906689 is a deficient number, since it is larger than the sum of its proper divisors (17853567).

1838906689 is a wasteful number, since it uses less digits than its factorization.

1838906689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17853566.

The product of its (nonzero) digits is 4478976, while the sum is 58.

The square root of 1838906689 is about 42882.4753133492. The cubic root of 1838906689 is about 1225.1423827837.

The spelling of 1838906689 in words is "one billion, eight hundred thirty-eight million, nine hundred six thousand, six hundred eighty-nine".