1189200920 has 64 divisors (see below), whose sum is σ = 2789130240. Its totient is φ = 455817600.

The previous prime is 1189200919. The next prime is 1189200923. The reversal of 1189200920 is 290029811.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1189200923) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 123065 + ... + 132375.

It is an arithmetic number, because the mean of its divisors is an integer number (43580160).

Almost surely, 2^1189200920 is an apocalyptic number.

1189200920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1189200920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1394565120).

1189200920 is an abundant number, since it is smaller than the sum of its proper divisors (1599929320).

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

1189200920 is a wasteful number, since it uses less digits than its factorization.

1189200920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9456 (or 9452 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 1189200920 is about 34484.7925903579. The cubic root of 1189200920 is about 1059.4612546494.

The spelling of 1189200920 in words is "one billion, one hundred eighty-nine million, two hundred thousand, nine hundred twenty".