1189870812 has 72 divisors (see below), whose sum is σ = 3350823840. Its totient is φ = 353485440.

The previous prime is 1189870811. The next prime is 1189870831. The reversal of 1189870812 is 2180789811.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1189870811) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30264 + ... + 57407.

It is an arithmetic number, because the mean of its divisors is an integer number (46539220).

Almost surely, 2^1189870812 is an apocalyptic number.

1189870812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1189870812 is an abundant number, since it is smaller than the sum of its proper divisors (2160953028).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1189870812 is a wasteful number, since it uses less digits than its factorization.

1189870812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87723 (or 87718 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 45.

The square root of 1189870812 is about 34494.5040839842. The cubic root of 1189870812 is about 1059.6601533056.

The spelling of 1189870812 in words is "one billion, one hundred eighty-nine million, eight hundred seventy thousand, eight hundred twelve".