1197899989 has 32 divisors (see below), whose sum is σ = 1439907840. Its totient is φ = 982238400.

The previous prime is 1197899987. The next prime is 1197900017. The reversal of 1197899989 is 9899987911.

It is not a de Polignac number, because 1197899989 - 2¹ = 1197899987 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 (1197899987) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1208284 + ... + 1209274.

It is an arithmetic number, because the mean of its divisors is an integer number (44997120).

Almost surely, 2^1197899989 is an apocalyptic number.

It is an amenable number.

1197899989 is a deficient number, since it is larger than the sum of its proper divisors (242007851).

1197899989 is a wasteful number, since it uses less digits than its factorization.

1197899989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1201.

The product of its digits is 26453952, while the sum is 70.

The square root of 1197899989 is about 34610.6918307046. The cubic root of 1197899989 is about 1062.0383198154.

The spelling of 1197899989 in words is "one billion, one hundred ninety-seven million, eight hundred ninety-nine thousand, nine hundred eighty-nine".