189925840 has 160 divisors (see below), whose sum is σ = 505967616. Its totient is φ = 65802240.

The previous prime is 189925831. The next prime is 189925849. The reversal of 189925840 is 48529981.

It is an interprime number because it is at equal distance from previous prime (189925831) and next prime (189925849).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189925849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1386252 + ... + 1386388.

Almost surely, 2^189925840 is an apocalyptic number.

189925840 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 189925840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (252983808).

189925840 is an abundant number, since it is smaller than the sum of its proper divisors (316041776).

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

189925840 is a wasteful number, since it uses less digits than its factorization.

189925840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237 (or 231 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 46.

The square root of 189925840 is about 13781.3584236098. The cubic root of 189925840 is about 574.8149019843.

The spelling of 189925840 in words is "one hundred eighty-nine million, nine hundred twenty-five thousand, eight hundred forty".