189857640 has 256 divisors, whose sum is σ = 703365120. Its totient is φ = 40043520.

The previous prime is 189857627. The next prime is 189857651. The reversal of 189857640 is 46758981.

It is a self number, because there is not a number n which added to its sum of digits gives 189857640.

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, 598762 + ... + 599078.

It is an arithmetic number, because the mean of its divisors is an integer number (2747520).

Almost surely, 2^189857640 is an apocalyptic number.

189857640 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 189857640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (351682560).

189857640 is an abundant number, since it is smaller than the sum of its proper divisors (513507480).

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

189857640 is a wasteful number, since it uses less digits than its factorization.

189857640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392 (or 388 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 48.

The square root of 189857640 is about 13778.8838444919. The cubic root of 189857640 is about 574.7460907935.

The spelling of 189857640 in words is "one hundred eighty-nine million, eight hundred fifty-seven thousand, six hundred forty".