1187899668 has 96 divisors (see below), whose sum is σ = 3135968640. Its totient is φ = 393660000.

The previous prime is 1187899649. The next prime is 1187899693. The reversal of 1187899668 is 8669987811.

It is a super-2 number, since 2×1187899668² = 2822211242469020448, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2195478 + ... + 2196018.

It is an arithmetic number, because the mean of its divisors is an integer number (32666340).

Almost surely, 2^1187899668 is an apocalyptic number.

1187899668 is a gapful number since it is divisible by the number (18) 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 1187899668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1567984320).

1187899668 is an abundant number, since it is smaller than the sum of its proper divisors (1948068972).

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

1187899668 is an equidigital number, since it uses as much as digits as its factorization.

1187899668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 817 (or 797 counting only the distinct ones).

The product of its digits is 10450944, while the sum is 63.

The square root of 1187899668 is about 34465.9203852153. The cubic root of 1187899668 is about 1059.0746843620.

The spelling of 1187899668 in words is "one billion, one hundred eighty-seven million, eight hundred ninety-nine thousand, six hundred sixty-eight".