1197644789 has 12 divisors (see below), whose sum is σ = 1324729152. Its totient is φ = 1073800800.

The previous prime is 1197644783. The next prime is 1197644807. The reversal of 1197644789 is 9874467911.

It is not a de Polignac number, because 1197644789 - 2²⁴ = 1180867573 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 (1197644783) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 48404 + ... + 68834.

It is an arithmetic number, because the mean of its divisors is an integer number (110394096).

Almost surely, 2^1197644789 is an apocalyptic number.

It is an amenable number.

1197644789 is a deficient number, since it is larger than the sum of its proper divisors (127084363).

1197644789 is an equidigital number, since it uses as much as digits as its factorization.

1197644789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20588 (or 20515 counting only the distinct ones).

The product of its digits is 3048192, while the sum is 56.

The square root of 1197644789 is about 34607.0049123006. The cubic root of 1197644789 is about 1061.9628957592.

It can be divided in two parts, 11976 and 44789, that added together give a palindrome (56765).

The spelling of 1197644789 in words is "one billion, one hundred ninety-seven million, six hundred forty-four thousand, seven hundred eighty-nine".