1189440 has 168 divisors, whose sum is σ = 4754880. Its totient is φ = 267264.

The previous prime is 1189417. The next prime is 1189453. The reversal of 1189440 is 449811.

It is a tau number, because it is divible by the number of its divisors (168).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20131 + ... + 20189.

2^1189440 is an apocalyptic number.

1189440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1189440 is the 630-th octagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1189440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2377440).

1189440 is an abundant number, since it is smaller than the sum of its proper divisors (3565440).

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

1189440 is a wasteful number, since it uses less digits than its factorization.

1189440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89 (or 76 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 1189440 is about 1090.6145056802. The cubic root of 1189440 is about 105.9532248827.

The spelling of 1189440 in words is "one million, one hundred eighty-nine thousand, four hundred forty".