189590421 has 4 divisors (see below), whose sum is σ = 252787232. Its totient is φ = 126393612.

The previous prime is 189590351. The next prime is 189590447. The reversal of 189590421 is 124095981.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 189590421 - 2¹⁸ = 189328277 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 189590421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189590461) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31598401 + ... + 31598406.

It is an arithmetic number, because the mean of its divisors is an integer number (63196808).

Almost surely, 2^189590421 is an apocalyptic number.

It is an amenable number.

189590421 is a deficient number, since it is larger than the sum of its proper divisors (63196811).

189590421 is an equidigital number, since it uses as much as digits as its factorization.

189590421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63196810.

The product of its (nonzero) digits is 25920, while the sum is 39.

The square root of 189590421 is about 13769.1837448703. The cubic root of 189590421 is about 574.4763181601.

The spelling of 189590421 in words is "one hundred eighty-nine million, five hundred ninety thousand, four hundred twenty-one".