83749439 has 2 divisors, whose sum is σ = 83749440. Its totient is φ = 83749438.

The previous prime is 83749427. The next prime is 83749447. The reversal of 83749439 is 93494738.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-83749439 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 83749393 and 83749402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (83749499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41874719 + 41874720.

It is an arithmetic number, because the mean of its divisors is an integer number (41874720).

Almost surely, 2^83749439 is an apocalyptic number.

83749439 is a deficient number, since it is larger than the sum of its proper divisors (1).

83749439 is an equidigital number, since it uses as much as digits as its factorization.

83749439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 653184, while the sum is 47.

The square root of 83749439 is about 9151.4719581060. The cubic root of 83749439 is about 437.5160292358.

The spelling of 83749439 in words is "eighty-three million, seven hundred forty-nine thousand, four hundred thirty-nine".