1326197889 has 27 divisors (see below), whose sum is σ = 1957373379. Its totient is φ = 865267920.

The previous prime is 1326197879. The next prime is 1326197909. The reversal of 1326197889 is 9887916231.

The square root of 1326197889 is 36417.

It is a perfect power (a square), and thus also a powerful number.

1326197889 is a `hidden beast` number, since 13 + 2 + 619 + 7 + 8 + 8 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 43125489 + 1283072400 = 6567^2 + 35820^2 .

It is not a de Polignac number, because 1326197889 - 2⁵ = 1326197857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1326197819) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 6664212 + ... + 6664410.

Almost surely, 2^1326197889 is an apocalyptic number.

1326197889 is the 36417-th square number.

1326197889 is the 18209-th centered octagonal number.

It is an amenable number.

1326197889 is a deficient number, since it is larger than the sum of its proper divisors (631175490).

1326197889 is an frugal number, since it uses more digits than its factorization.

1326197889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 526 (or 263 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 54.

The cubic root of 1326197889 is about 1098.6755102541.

The spelling of 1326197889 in words is "one billion, three hundred twenty-six million, one hundred ninety-seven thousand, eight hundred eighty-nine".