1989939 has 12 divisors (see below), whose sum is σ = 3086664. Its totient is φ = 1137024.

The previous prime is 1989919. The next prime is 1989947. The reversal of 1989939 is 9399891.

It is not a de Polignac number, because 1989939 - 2⁷ = 1989811 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1989919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6622 + ... + 6915.

It is an arithmetic number, because the mean of its divisors is an integer number (257222).

2^1989939 is an apocalyptic number.

1989939 is a deficient number, since it is larger than the sum of its proper divisors (1096725).

1989939 is a wasteful number, since it uses less digits than its factorization.

1989939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13554 (or 13547 counting only the distinct ones).

The product of its digits is 157464, while the sum is 48.

The square root of 1989939 is about 1410.6519769241. The cubic root of 1989939 is about 125.7804819739.

Subtracting from 1989939 its sum of digits (48), we obtain a palindrome (1989891).

The spelling of 1989939 in words is "one million, nine hundred eighty-nine thousand, nine hundred thirty-nine".