189421 has 2 divisors, whose sum is σ = 189422. Its totient is φ = 189420.
The previous prime is 189407. The next prime is 189433. The reversal of 189421 is 124981.
It is a happy number.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 189225 + 196 = 435^2 + 14^2 .
It is an emirp because it is prime and its reverse (124981) is a distict prime.
It is a cyclic number.
It is not a de Polignac number, because 189421 - 25 = 189389 is a prime.
It is a pancake number, because a pancake can be divided into 189421 parts by 615 straight cuts.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (189401) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94710 + 94711.
It is an arithmetic number, because the mean of its divisors is an integer number (94711).
2189421 is an apocalyptic number.
It is an amenable number.
189421 is a deficient number, since it is larger than the sum of its proper divisors (1).
189421 is an equidigital number, since it uses as much as digits as its factorization.
189421 is an evil number, because the sum of its binary digits is even.
The product of its digits is 576, while the sum is 25.
The square root of 189421 is about 435.2252290481. The cubic root of 189421 is about 57.4305146787.
The spelling of 189421 in words is "one hundred eighty-nine thousand, four hundred twenty-one".
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