188381340 has 144 divisors (see below), whose sum is σ = 656527872. Its totient is φ = 42830208.

The previous prime is 188381269. The next prime is 188381353. The reversal of 188381340 is 43183881.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 188381295 and 188381304.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 386577 + ... + 387063.

Almost surely, 2^188381340 is an apocalyptic number.

188381340 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 188381340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (328263936).

188381340 is an abundant number, since it is smaller than the sum of its proper divisors (468146532).

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

188381340 is a wasteful number, since it uses less digits than its factorization.

188381340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 816 (or 811 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 188381340 is about 13725.2081951423. The cubic root of 188381340 is about 573.2525042292.

The spelling of 188381340 in words is "one hundred eighty-eight million, three hundred eighty-one thousand, three hundred forty".