83440639 has 2 divisors, whose sum is σ = 83440640. Its totient is φ = 83440638.

The previous prime is 83440631. The next prime is 83440649. The reversal of 83440639 is 93604438.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 83440639 - 2³ = 83440631 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 83440598 and 83440607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (83440631) 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, 41720319 + 41720320.

It is an arithmetic number, because the mean of its divisors is an integer number (41720320).

Almost surely, 2^83440639 is an apocalyptic number.

83440639 is a deficient number, since it is larger than the sum of its proper divisors (1).

83440639 is an equidigital number, since it uses as much as digits as its factorization.

83440639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62208, while the sum is 37.

The square root of 83440639 is about 9134.5847743617. The cubic root of 83440639 is about 436.9776322232.

The spelling of 83440639 in words is "eighty-three million, four hundred forty thousand, six hundred thirty-nine".