189821140 has 24 divisors (see below), whose sum is σ = 399411432. Its totient is φ = 75778560.

The previous prime is 189821111. The next prime is 189821147. The reversal of 189821140 is 41128981.

It can be written as a sum of positive squares in 4 ways, for example, as 868624 + 188952516 = 932^2 + 13746^2 .

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 189821096 and 189821105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189821147) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1312 + ... + 19528.

It is an arithmetic number, because the mean of its divisors is an integer number (16642143).

Almost surely, 2^189821140 is an apocalyptic number.

189821140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

189821140 is an abundant number, since it is smaller than the sum of its proper divisors (209590292).

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

189821140 is a wasteful number, since it uses less digits than its factorization.

189821140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18747 (or 18745 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 34.

The square root of 189821140 is about 13777.5592903823. The cubic root of 189821140 is about 574.7092569201.

The spelling of 189821140 in words is "one hundred eighty-nine million, eight hundred twenty-one thousand, one hundred forty".