188421240 has 128 divisors (see below), whose sum is σ = 661893120. Its totient is φ = 42009600.

The previous prime is 188421229. The next prime is 188421263. The reversal of 188421240 is 42124881.

188421240 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a junction number, because it is equal to n+sod(n) for n = 188421198 and 188421207.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31705 + ... + 37175.

It is an arithmetic number, because the mean of its divisors is an integer number (5171040).

Almost surely, 2^188421240 is an apocalyptic number.

188421240 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 188421240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (330946560).

188421240 is an abundant number, since it is smaller than the sum of its proper divisors (473471880).

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

188421240 is a wasteful number, since it uses less digits than its factorization.

188421240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5533 (or 5529 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 30.

The square root of 188421240 is about 13726.6616480483. The cubic root of 188421240 is about 573.2929738431.

The spelling of 188421240 in words is "one hundred eighty-eight million, four hundred twenty-one thousand, two hundred forty".