1189808380 has 12 divisors (see below), whose sum is σ = 2498597640. Its totient is φ = 475923344.

The previous prime is 1189808351. The next prime is 1189808383. The reversal of 1189808380 is 838089811.

It is a super-2 number, since 2×1189808380² = 2831287962236448800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1189808380.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1189808383) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29745190 + ... + 29745229.

It is an arithmetic number, because the mean of its divisors is an integer number (208216470).

Almost surely, 2^1189808380 is an apocalyptic number.

1189808380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1189808380 is an abundant number, since it is smaller than the sum of its proper divisors (1308789260).

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

1189808380 is a wasteful number, since it uses less digits than its factorization.

1189808380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59490428 (or 59490426 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 46.

The square root of 1189808380 is about 34493.5991163578. The cubic root of 1189808380 is about 1059.6416196802.

The spelling of 1189808380 in words is "one billion, one hundred eighty-nine million, eight hundred eight thousand, three hundred eighty".