1189840 has 40 divisors (see below), whose sum is σ = 2812320. Its totient is φ = 468096.

The previous prime is 1189831. The next prime is 1189843. The reversal of 1189840 is 489811.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1189843) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8491 + ... + 8629.

It is an arithmetic number, because the mean of its divisors is an integer number (70308).

2^1189840 is an apocalyptic number.

1189840 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 1189840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1406160).

1189840 is an abundant number, since it is smaller than the sum of its proper divisors (1622480).

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

1189840 is a wasteful number, since it uses less digits than its factorization.

1189840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259 (or 253 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 1189840 is about 1090.7978731186. The cubic root of 1189840 is about 105.9651006506.

The spelling of 1189840 in words is "one million, one hundred eighty-nine thousand, eight hundred forty".