1897796889 has 18 divisors (see below), whose sum is σ = 2809775358. Its totient is φ = 1234329600.

The previous prime is 1897796867. The next prime is 1897796899. The reversal of 1897796889 is 9886977981.

It can be written as a sum of positive squares in 3 ways, for example, as 241958025 + 1655838864 = 15555^2 + 40692^2 .

It is not a de Polignac number, because 1897796889 - 2⁸ = 1897796633 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1897796899) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 47592 + ... + 77849.

It is an arithmetic number, because the mean of its divisors is an integer number (156098631).

Almost surely, 2^1897796889 is an apocalyptic number.

It is an amenable number.

1897796889 is a deficient number, since it is larger than the sum of its proper divisors (911978469).

1897796889 is a wasteful number, since it uses less digits than its factorization.

1897796889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125529 (or 125485 counting only the distinct ones).

The product of its digits is 109734912, while the sum is 72.

The square root of 1897796889 is about 43563.7106890586. The cubic root of 1897796889 is about 1238.0834268862.

The spelling of 1897796889 in words is "one billion, eight hundred ninety-seven million, seven hundred ninety-six thousand, eight hundred eighty-nine".