189397221787254 has 64 divisors (see below), whose sum is σ = 408074087038464. Its totient is φ = 58255841834496.

The previous prime is 189397221787229. The next prime is 189397221787307. The reversal of 189397221787254 is 452787122793981.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3189710814 + ... + 3189770190.

It is an arithmetic number, because the mean of its divisors is an integer number (6376157609976).

Almost surely, 2^{189397221787254} is an apocalyptic number.

189397221787254 is an abundant number, since it is smaller than the sum of its proper divisors (218676865251210).

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

189397221787254 is a wasteful number, since it uses less digits than its factorization.

189397221787254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72901.

The product of its digits is 853493760, while the sum is 75.

The spelling of 189397221787254 in words is "one hundred eighty-nine trillion, three hundred ninety-seven billion, two hundred twenty-one million, seven hundred eighty-seven thousand, two hundred fifty-four".