1639889889 has 12 divisors (see below), whose sum is σ = 2403365328. Its totient is φ = 993872440.

The previous prime is 1639889873. The next prime is 1639889893. The reversal of 1639889889 is 9889889361.

It is not a de Polignac number, because 1639889889 - 2⁴ = 1639889873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1639889809) 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 in 11 ways as a sum of consecutive naturals, for example, 2258439 + ... + 2259164.

It is an arithmetic number, because the mean of its divisors is an integer number (200280444).

Almost surely, 2^1639889889 is an apocalyptic number.

It is an amenable number.

1639889889 is a deficient number, since it is larger than the sum of its proper divisors (763475439).

1639889889 is a wasteful number, since it uses less digits than its factorization.

1639889889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4517628 (or 4517617 counting only the distinct ones).

The product of its digits is 53747712, while the sum is 69.

The square root of 1639889889 is about 40495.5539411427. The cubic root of 1639889889 is about 1179.2473149222.

The spelling of 1639889889 in words is "one billion, six hundred thirty-nine million, eight hundred eighty-nine thousand, eight hundred eighty-nine".