1188640 has 96 divisors (see below), whose sum is σ = 3265920. Its totient is φ = 405504.

The previous prime is 1188637. The next prime is 1188653. The reversal of 1188640 is 468811.

It is a junction number, because it is equal to n+sod(n) for n = 1188599 and 1188608.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51669 + ... + 51691.

It is an arithmetic number, because the mean of its divisors is an integer number (34020).

2^1188640 is an apocalyptic number.

1188640 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 1188640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1632960).

1188640 is an abundant number, since it is smaller than the sum of its proper divisors (2077280).

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

1188640 is a wasteful number, since it uses less digits than its factorization.

1188640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74 (or 66 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 28.

The square root of 1188640 is about 1090.2476782823. The cubic root of 1188640 is about 105.9294653571.

The spelling of 1188640 in words is "one million, one hundred eighty-eight thousand, six hundred forty".