83990239 has 2 divisors, whose sum is σ = 83990240. Its totient is φ = 83990238.

The previous prime is 83990237. The next prime is 83990243. The reversal of 83990239 is 93209938.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 83990239 - 2¹ = 83990237 is a prime.

Together with 83990237, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 83990195 and 83990204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (83990237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41995119 + 41995120.

It is an arithmetic number, because the mean of its divisors is an integer number (41995120).

Almost surely, 2^83990239 is an apocalyptic number.

83990239 is a deficient number, since it is larger than the sum of its proper divisors (1).

83990239 is an equidigital number, since it uses as much as digits as its factorization.

83990239 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 104976, while the sum is 43.

The square root of 83990239 is about 9164.6188682345. The cubic root of 83990239 is about 437.9349496466.

The spelling of 83990239 in words is "eighty-three million, nine hundred ninety thousand, two hundred thirty-nine".