1187889120 has 288 divisors, whose sum is σ = 4656113280. Its totient is φ = 272747520.

The previous prime is 1187889091. The next prime is 1187889133. The reversal of 1187889120 is 219887811.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (288).

It is a super-2 number, since 2×1187889120² = 2822161122828748800, which contains 22 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

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 47 ways as a sum of consecutive naturals, for example, 298987 + ... + 302933.

It is an arithmetic number, because the mean of its divisors is an integer number (16167060).

Almost surely, 2^1187889120 is an apocalyptic number.

1187889120 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 1187889120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2328056640).

1187889120 is an abundant number, since it is smaller than the sum of its proper divisors (3468224160).

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

1187889120 is a wasteful number, since it uses less digits than its factorization.

1187889120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3998 (or 3987 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 45.

The square root of 1187889120 is about 34465.7673641542. The cubic root of 1187889120 is about 1059.0715496549.

The spelling of 1187889120 in words is "one billion, one hundred eighty-seven million, eight hundred eighty-nine thousand, one hundred twenty".