83983709 has 4 divisors (see below), whose sum is σ = 84224700. Its totient is φ = 83742720.

The previous prime is 83983663. The next prime is 83983717. The reversal of 83983709 is 90738938.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90738938 = 2 ⋅45369469.

It can be written as a sum of positive squares in 2 ways, for example, as 29268100 + 54715609 = 5410^2 + 7397^2 .

It is a cyclic number.

It is not a de Polignac number, because 83983709 - 2²⁴ = 67206493 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83983789) 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, 119972 + ... + 120669.

It is an arithmetic number, because the mean of its divisors is an integer number (21056175).

Almost surely, 2^83983709 is an apocalyptic number.

It is an amenable number.

83983709 is a deficient number, since it is larger than the sum of its proper divisors (240991).

83983709 is a wasteful number, since it uses less digits than its factorization.

83983709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240990.

The product of its (nonzero) digits is 326592, while the sum is 47.

The square root of 83983709 is about 9164.2625999040. The cubic root of 83983709 is about 437.9235999574.

It can be divided in two parts, 839 and 83709, that added together give a palindrome (84548).

The spelling of 83983709 in words is "eighty-three million, nine hundred eighty-three thousand, seven hundred nine".