1197899389 has 4 divisors (see below), whose sum is σ = 1199221024. Its totient is φ = 1196577756.

The previous prime is 1197899333. The next prime is 1197899399. The reversal of 1197899389 is 9839987911.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1197899389 - 2¹⁷ = 1197768317 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1197899389.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1197899399) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 659457 + ... + 661270.

It is an arithmetic number, because the mean of its divisors is an integer number (299805256).

Almost surely, 2^1197899389 is an apocalyptic number.

It is an amenable number.

1197899389 is a deficient number, since it is larger than the sum of its proper divisors (1321635).

1197899389 is an equidigital number, since it uses as much as digits as its factorization.

1197899389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1321634.

The product of its digits is 8817984, while the sum is 64.

The square root of 1197899389 is about 34610.6831628617. The cubic root of 1197899389 is about 1062.0381424987.

The spelling of 1197899389 in words is "one billion, one hundred ninety-seven million, eight hundred ninety-nine thousand, three hundred eighty-nine".