1985206039 has 2 divisors, whose sum is σ = 1985206040. Its totient is φ = 1985206038.

The previous prime is 1985206037. The next prime is 1985206081. The reversal of 1985206039 is 9306025891.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1985206039 - 2¹ = 1985206037 is a prime.

Together with 1985206037, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1985205986 and 1985206004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1985206033) 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, 992603019 + 992603020.

It is an arithmetic number, because the mean of its divisors is an integer number (992603020).

Almost surely, 2^1985206039 is an apocalyptic number.

1985206039 is a deficient number, since it is larger than the sum of its proper divisors (1).

1985206039 is an equidigital number, since it uses as much as digits as its factorization.

1985206039 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 116640, while the sum is 43.

The square root of 1985206039 is about 44555.6510332865. The cubic root of 1985206039 is about 1256.8068214512.

The spelling of 1985206039 in words is "one billion, nine hundred eighty-five million, two hundred six thousand, thirty-nine".