1189990965 has 16 divisors (see below), whose sum is σ = 1925380800. Its totient is φ = 627530112.

The previous prime is 1189990961. The next prime is 1189990969. The reversal of 1189990965 is 5690999811.

It is an interprime number because it is at equal distance from previous prime (1189990961) and next prime (1189990969).

It is not a de Polignac number, because 1189990965 - 2² = 1189990961 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1189990961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 444355 + ... + 447024.

It is an arithmetic number, because the mean of its divisors is an integer number (120336300).

Almost surely, 2^1189990965 is an apocalyptic number.

1189990965 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1189990965 is a deficient number, since it is larger than the sum of its proper divisors (735389835).

1189990965 is an equidigital number, since it uses as much as digits as its factorization.

1189990965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 891476.

The product of its (nonzero) digits is 1574640, while the sum is 57.

The square root of 1189990965 is about 34496.2456652894. The cubic root of 1189990965 is about 1059.6958202200.

The spelling of 1189990965 in words is "one billion, one hundred eighty-nine million, nine hundred ninety thousand, nine hundred sixty-five".