189355621 has 16 divisors (see below), whose sum is σ = 238017024. Its totient is φ = 146628864.

The previous prime is 189355613. The next prime is 189355631. The reversal of 189355621 is 126553981.

189355621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 189355621 - 2³ = 189355613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189355631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17860 + ... + 26413.

It is an arithmetic number, because the mean of its divisors is an integer number (14876064).

Almost surely, 2^189355621 is an apocalyptic number.

It is an amenable number.

189355621 is a deficient number, since it is larger than the sum of its proper divisors (48661403).

189355621 is a wasteful number, since it uses less digits than its factorization.

189355621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44340.

The product of its digits is 64800, while the sum is 40.

The square root of 189355621 is about 13760.6548172680. The cubic root of 189355621 is about 574.2390650310.

The spelling of 189355621 in words is "one hundred eighty-nine million, three hundred fifty-five thousand, six hundred twenty-one".