188740 has 12 divisors (see below), whose sum is σ = 396396. Its totient is φ = 75488.

The previous prime is 188729. The next prime is 188753. The reversal of 188740 is 47881.

It can be written as a sum of positive squares in 2 ways, for example, as 87616 + 101124 = 296^2 + 318^2 .

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 188699 and 188708.

It is an unprimeable number.

188740 is an untouchable number, because it is not equal to the sum of proper divisors of any 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 3 ways as a sum of consecutive naturals, for example, 4699 + ... + 4738.

It is an arithmetic number, because the mean of its divisors is an integer number (33033).

2¹⁸⁸⁷⁴⁰ is an apocalyptic number.

188740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

188740 is an abundant number, since it is smaller than the sum of its proper divisors (207656).

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

188740 is a wasteful number, since it uses less digits than its factorization.

188740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9446 (or 9444 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 28.

The square root of 188740 is about 434.4421710654. The cubic root of 188740 is about 57.3616079515.

The spelling of 188740 in words is "one hundred eighty-eight thousand, seven hundred forty".