83966389 has 4 divisors (see below), whose sum is σ = 90425356. Its totient is φ = 77507424.

The previous prime is 83966347. The next prime is 83966423. The reversal of 83966389 is 98366938.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98366938 = 2 ⋅49183469.

It can be written as a sum of positive squares in 2 ways, for example, as 24830289 + 59136100 = 4983^2 + 7690^2 .

It is a cyclic number.

It is not a de Polignac number, because 83966389 - 2⁹ = 83965877 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 (83966329) 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, 3229464 + ... + 3229489.

It is an arithmetic number, because the mean of its divisors is an integer number (22606339).

Almost surely, 2^83966389 is an apocalyptic number.

It is an amenable number.

83966389 is a deficient number, since it is larger than the sum of its proper divisors (6458967).

83966389 is a wasteful number, since it uses less digits than its factorization.

83966389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6458966.

The product of its digits is 1679616, while the sum is 52.

The square root of 83966389 is about 9163.3175760747. The cubic root of 83966389 is about 437.8934934907.

The spelling of 83966389 in words is "eighty-three million, nine hundred sixty-six thousand, three hundred eighty-nine".