189408078009 has 24 divisors (see below), whose sum is σ = 288064445760. Its totient is φ = 119594770272.

The previous prime is 189408077951. The next prime is 189408078017. The reversal of 189408078009 is 900870804981.

189408078009 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 189408078009 - 2⁸ = 189408077753 is a prime.

It is not an unprimeable number, because it can be changed into a prime (189408078109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 517207 + ... + 803939.

It is an arithmetic number, because the mean of its divisors is an integer number (12002685240).

Almost surely, 2^189408078009 is an apocalyptic number.

189408078009 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

189408078009 is a deficient number, since it is larger than the sum of its proper divisors (98656367751).

189408078009 is a wasteful number, since it uses less digits than its factorization.

189408078009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290621 (or 290618 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 54.

The spelling of 189408078009 in words is "one hundred eighty-nine billion, four hundred eight million, seventy-eight thousand, nine".