189921654 has 48 divisors (see below), whose sum is σ = 469228032. Its totient is φ = 54998784.

The previous prime is 189921653. The next prime is 189921659. The reversal of 189921654 is 456129981.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189921653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19894 + ... + 27849.

It is an arithmetic number, because the mean of its divisors is an integer number (9775584).

Almost surely, 2^189921654 is an apocalyptic number.

189921654 is an abundant number, since it is smaller than the sum of its proper divisors (279306378).

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

189921654 is a wasteful number, since it uses less digits than its factorization.

189921654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47781 (or 47778 counting only the distinct ones).

The product of its digits is 155520, while the sum is 45.

The square root of 189921654 is about 13781.2065509519. The cubic root of 189921654 is about 574.8106789450.

The spelling of 189921654 in words is "one hundred eighty-nine million, nine hundred twenty-one thousand, six hundred fifty-four".