1639999889 has 16 divisors (see below), whose sum is σ = 1871164800. Its totient is φ = 1422812160.

The previous prime is 1639999853. The next prime is 1639999897. The reversal of 1639999889 is 9889999361.

It is not a de Polignac number, because 1639999889 - 2⁸ = 1639999633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1639999289) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 106379 + ... + 120815.

It is an arithmetic number, because the mean of its divisors is an integer number (116947800).

Almost surely, 2^1639999889 is an apocalyptic number.

It is an amenable number.

1639999889 is a deficient number, since it is larger than the sum of its proper divisors (231164911).

1639999889 is a wasteful number, since it uses less digits than its factorization.

1639999889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14920.

The product of its digits is 68024448, while the sum is 71.

The square root of 1639999889 is about 40496.9120921583. The cubic root of 1639999889 is about 1179.2736813885.

The spelling of 1639999889 in words is "one billion, six hundred thirty-nine million, nine hundred ninety-nine thousand, eight hundred eighty-nine".