134921389 has 4 divisors (see below), whose sum is σ = 134987356. Its totient is φ = 134855424.

The previous prime is 134921383. The next prime is 134921407. The reversal of 134921389 is 983129431.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 983129431 = 17 ⋅57831143.

It can be written as a sum of positive squares in 2 ways, for example, as 2280100 + 132641289 = 1510^2 + 11517^2 .

It is a cyclic number.

It is not a de Polignac number, because 134921389 - 2¹⁹ = 134397101 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 (134921383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29814 + ... + 34039.

It is an arithmetic number, because the mean of its divisors is an integer number (33746839).

Almost surely, 2^134921389 is an apocalyptic number.

It is an amenable number.

134921389 is a deficient number, since it is larger than the sum of its proper divisors (65967).

134921389 is an equidigital number, since it uses as much as digits as its factorization.

134921389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65966.

The product of its digits is 46656, while the sum is 40.

The square root of 134921389 is about 11615.5666671928. The cubic root of 134921389 is about 512.8931921369.

The spelling of 134921389 in words is "one hundred thirty-four million, nine hundred twenty-one thousand, three hundred eighty-nine".