189238140 has 192 divisors, whose sum is σ = 724792320. Its totient is φ = 39916800.

The previous prime is 189238139. The next prime is 189238171. The reversal of 189238140 is 41832981.

It is a super-2 number, since 2×189238140² = 71622147261319200, which contains 22 as substring.

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 = 189238095 and 189238104.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 47215 + ... + 51065.

It is an arithmetic number, because the mean of its divisors is an integer number (3774960).

Almost surely, 2^189238140 is an apocalyptic number.

189238140 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 189238140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (362396160).

189238140 is an abundant number, since it is smaller than the sum of its proper divisors (535554180).

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

189238140 is a wasteful number, since it uses less digits than its factorization.

189238140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3889 (or 3881 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 189238140 is about 13756.3854264120. The cubic root of 189238140 is about 574.1202829992.

The spelling of 189238140 in words is "one hundred eighty-nine million, two hundred thirty-eight thousand, one hundred forty".