1889640899 has 16 divisors (see below), whose sum is σ = 2071980000. Its totient is φ = 1715341824.

The previous prime is 1889640889. The next prime is 1889640901. The reversal of 1889640899 is 9980469881.

It is a Cunningham number, because it is equal to 43470²-1.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1889640899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1889640829) 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 15 ways as a sum of consecutive naturals, for example, 737729 + ... + 740285.

It is an arithmetic number, because the mean of its divisors is an integer number (129498750).

Almost surely, 2^1889640899 is an apocalyptic number.

1889640899 is a deficient number, since it is larger than the sum of its proper divisors (182339101).

1889640899 is a wasteful number, since it uses less digits than its factorization.

1889640899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4102.

The product of its (nonzero) digits is 8957952, while the sum is 62.

The square root of 1889640899 is about 43469.9999884978. Note that the first 4 decimals coincide. The cubic root of 1889640899 is about 1236.3072803440.

It can be divided in two parts, 18896 and 40899, that added together give a palindrome (59795).

The spelling of 1889640899 in words is "one billion, eight hundred eighty-nine million, six hundred forty thousand, eight hundred ninety-nine".