1919999989 has 8 divisors (see below), whose sum is σ = 2021654240. Its totient is φ = 1818405936.

The previous prime is 1919999953. The next prime is 1920000037. The reversal of 1919999989 is 9899999191.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1919999989 - 2¹⁷ = 1919868917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1919999089) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60094 + ... + 86320.

It is an arithmetic number, because the mean of its divisors is an integer number (252706780).

Almost surely, 2^1919999989 is an apocalyptic number.

1919999989 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1919999989 is a deficient number, since it is larger than the sum of its proper divisors (101654251).

1919999989 is a wasteful number, since it uses less digits than its factorization.

1919999989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30099.

The product of its digits is 38263752, while the sum is 73.

The square root of 1919999989 is about 43817.8044748935. The cubic root of 1919999989 is about 1242.8930000080.

The spelling of 1919999989 in words is "one billion, nine hundred nineteen million, nine hundred ninety-nine thousand, nine hundred eighty-nine".