838134989 has 4 divisors (see below), whose sum is σ = 860787324. Its totient is φ = 815482656.

The previous prime is 838134977. The next prime is 838135007. The reversal of 838134989 is 989431838.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 989431838 = 2 ⋅494715919.

It can be written as a sum of positive squares in 2 ways, for example, as 804006025 + 34128964 = 28355^2 + 5842^2 .

It is a cyclic number.

It is not a de Polignac number, because 838134989 - 2²⁴ = 821357773 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 838134989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (838134919) 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, 11326112 + ... + 11326185.

It is an arithmetic number, because the mean of its divisors is an integer number (215196831).

Almost surely, 2^838134989 is an apocalyptic number.

It is an amenable number.

838134989 is a deficient number, since it is larger than the sum of its proper divisors (22652335).

838134989 is a wasteful number, since it uses less digits than its factorization.

838134989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22652334.

The product of its digits is 1492992, while the sum is 53.

The square root of 838134989 is about 28950.5611171873. The cubic root of 838134989 is about 942.8399809144.

The spelling of 838134989 in words is "eight hundred thirty-eight million, one hundred thirty-four thousand, nine hundred eighty-nine".