188389950 has 96 divisors (see below), whose sum is σ = 543179520. Its totient is φ = 42316800.

The previous prime is 188389919. The next prime is 188389951. The reversal of 188389950 is 59983881.

It is a super-2 number, since 2×188389950² = 70981546522005000, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 188389893 and 188389902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (188389951) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 60430 + ... + 63470.

It is an arithmetic number, because the mean of its divisors is an integer number (5658120).

Almost surely, 2^188389950 is an apocalyptic number.

188389950 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 188389950, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (271589760).

188389950 is an abundant number, since it is smaller than the sum of its proper divisors (354789570).

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

188389950 is a wasteful number, since it uses less digits than its factorization.

188389950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3122 (or 3117 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 51.

The square root of 188389950 is about 13725.5218480027. The cubic root of 188389950 is about 573.2612376294.

The spelling of 188389950 in words is "one hundred eighty-eight million, three hundred eighty-nine thousand, nine hundred fifty".