189506421 has 12 divisors (see below), whose sum is σ = 294787948. Its totient is φ = 116619264.

The previous prime is 189506417. The next prime is 189506459. The reversal of 189506421 is 124605981.

189506421 is a `hidden beast` number, since 1 + 8 + 9 + 5 + 0 + 642 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 9678321 + 179828100 = 3111^2 + 13410^2 .

It is not a de Polignac number, because 189506421 - 2² = 189506417 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189506521) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 809740 + ... + 809973.

Almost surely, 2^189506421 is an apocalyptic number.

It is an amenable number.

189506421 is a deficient number, since it is larger than the sum of its proper divisors (105281527).

189506421 is a wasteful number, since it uses less digits than its factorization.

189506421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1619732 (or 1619729 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 189506421 is about 13766.1331171829. The cubic root of 189506421 is about 574.3914630656.

The spelling of 189506421 in words is "one hundred eighty-nine million, five hundred six thousand, four hundred twenty-one".