1189885290 has 64 divisors (see below), whose sum is σ = 3119886720. Its totient is φ = 288035840.

The previous prime is 1189885253. The next prime is 1189885297. The reversal of 1189885290 is 925889811.

It is not an unprimeable number, because it can be changed into a prime (1189885297) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 264742 + ... + 269198.

It is an arithmetic number, because the mean of its divisors is an integer number (48748230).

Almost surely, 2^1189885290 is an apocalyptic number.

1189885290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1189885290, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1559943360).

1189885290 is an abundant number, since it is smaller than the sum of its proper divisors (1930001430).

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

1189885290 is a wasteful number, since it uses less digits than its factorization.

1189885290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5287.

The product of its (nonzero) digits is 414720, while the sum is 51.

The square root of 1189885290 is about 34494.7139428638. The cubic root of 1189885290 is about 1059.6644511665.

The spelling of 1189885290 in words is "one billion, one hundred eighty-nine million, eight hundred eighty-five thousand, two hundred ninety".