1189089720 has 640 divisors, whose sum is σ = 5098262400. Its totient is φ = 241864704.

The previous prime is 1189089709. The next prime is 1189089731. The reversal of 1189089720 is 279809811.

It is an interprime number because it is at equal distance from previous prime (1189089709) and next prime (1189089731).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 10909026 + ... + 10909134.

It is an arithmetic number, because the mean of its divisors is an integer number (7966035).

Almost surely, 2^1189089720 is an apocalyptic number.

1189089720 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 1189089720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2549131200).

1189089720 is an abundant number, since it is smaller than the sum of its proper divisors (3909172680).

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

1189089720 is a wasteful number, since it uses less digits than its factorization.

1189089720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189 (or 176 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 45.

The square root of 1189089720 is about 34483.1802477672. The cubic root of 1189089720 is about 1059.4282308596.

The spelling of 1189089720 in words is "one billion, one hundred eighty-nine million, eighty-nine thousand, seven hundred twenty".