1985939 has 2 divisors, whose sum is σ = 1985940. Its totient is φ = 1985938.

The previous prime is 1985903. The next prime is 1985987. The reversal of 1985939 is 9395891.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1985939 - 2¹⁶ = 1920403 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1985939.

It is not a weakly prime, because it can be changed into another prime (1985989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 992969 + 992970.

It is an arithmetic number, because the mean of its divisors is an integer number (992970).

2^1985939 is an apocalyptic number.

1985939 is a deficient number, since it is larger than the sum of its proper divisors (1).

1985939 is an equidigital number, since it uses as much as digits as its factorization.

1985939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 87480, while the sum is 44.

The square root of 1985939 is about 1409.2334795909. The cubic root of 1985939 is about 125.6961478284.

It can be divided in two parts, 19 and 85939, that added together give a palindrome (85958).

The spelling of 1985939 in words is "one million, nine hundred eighty-five thousand, nine hundred thirty-nine".