1897135889 has 6 divisors (see below), whose sum is σ = 2085281730. Its totient is φ = 1724668880.

The previous prime is 1897135879. The next prime is 1897135907. The reversal of 1897135889 is 9885317981.

It can be written as a sum of positive squares in only one way, i.e., 1522326289 + 374809600 = 39017^2 + 19360^2 .

It is not a de Polignac number, because 1897135889 - 2²⁰ = 1896087313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1897135879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7839284 + ... + 7839525.

It is an arithmetic number, because the mean of its divisors is an integer number (347546955).

Almost surely, 2^1897135889 is an apocalyptic number.

It is an amenable number.

1897135889 is a deficient number, since it is larger than the sum of its proper divisors (188145841).

1897135889 is a wasteful number, since it uses less digits than its factorization.

1897135889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15678831 (or 15678820 counting only the distinct ones).

The product of its digits is 4354560, while the sum is 59.

The square root of 1897135889 is about 43556.1234386165. The cubic root of 1897135889 is about 1237.9396692865.

The spelling of 1897135889 in words is "one billion, eight hundred ninety-seven million, one hundred thirty-five thousand, eight hundred eighty-nine".