1189855320 has 64 divisors (see below), whose sum is σ = 3724773120. Its totient is φ = 303498624.

The previous prime is 1189855273. The next prime is 1189855327. The reversal of 1189855320 is 235589811.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1189855327) 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, 212794 + ... + 218313.

It is an arithmetic number, because the mean of its divisors is an integer number (58199580).

Almost surely, 2^1189855320 is an apocalyptic number.

1189855320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1189855320 is an abundant number, since it is smaller than the sum of its proper divisors (2534917800).

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

1189855320 is a wasteful number, since it uses less digits than its factorization.

1189855320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431144 (or 431140 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 42.

The square root of 1189855320 is about 34494.2795257417. The cubic root of 1189855320 is about 1059.6555543956.

The spelling of 1189855320 in words is "one billion, one hundred eighty-nine million, eight hundred fifty-five thousand, three hundred twenty".