1188390 has 32 divisors (see below), whose sum is σ = 3260160. Its totient is φ = 271584.

The previous prime is 1188389. The next prime is 1188409. The reversal of 1188390 is 938811.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a plaindrome in base 16.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2620 + ... + 3039.

It is an arithmetic number, because the mean of its divisors is an integer number (101880).

2^1188390 is an apocalyptic number.

1188390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1188390 is an abundant number, since it is smaller than the sum of its proper divisors (2071770).

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

1188390 is a wasteful number, since it uses less digits than its factorization.

1188390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5676.

The product of its (nonzero) digits is 1728, while the sum is 30.

The square root of 1188390 is about 1090.1330194063. The cubic root of 1188390 is about 105.9220383192.

The spelling of 1188390 in words is "one million, one hundred eighty-eight thousand, three hundred ninety".