189809972 has 24 divisors (see below), whose sum is σ = 363031200. Its totient is φ = 86118560.

The previous prime is 189809969. The next prime is 189810059. The reversal of 189809972 is 279908981.

189809972 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22154 + ... + 29502.

It is an arithmetic number, because the mean of its divisors is an integer number (15126300).

Almost surely, 2^189809972 is an apocalyptic number.

It is an amenable number.

189809972 is a deficient number, since it is larger than the sum of its proper divisors (173221228).

189809972 is a wasteful number, since it uses less digits than its factorization.

189809972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7951 (or 7949 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 53.

The square root of 189809972 is about 13777.1539876710. The cubic root of 189809972 is about 574.6979858207.

Subtracting 189809972 from its reverse (279908981), we obtain a palindrome (90099009).

The spelling of 189809972 in words is "one hundred eighty-nine million, eight hundred nine thousand, nine hundred seventy-two".