189396339439 has 4 divisors (see below), whose sum is σ = 190530449424. Its totient is φ = 188262229456.

The previous prime is 189396339389. The next prime is 189396339443. The reversal of 189396339439 is 934933693981.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 189396339439 - 2²¹ = 189394242287 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189396339469) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 567054742 + ... + 567055075.

It is an arithmetic number, because the mean of its divisors is an integer number (47632612356).

Almost surely, 2^189396339439 is an apocalyptic number.

189396339439 is a deficient number, since it is larger than the sum of its proper divisors (1134109985).

189396339439 is a wasteful number, since it uses less digits than its factorization.

189396339439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1134109984.

The product of its digits is 102036672, while the sum is 67.

The spelling of 189396339439 in words is "one hundred eighty-nine billion, three hundred ninety-six million, three hundred thirty-nine thousand, four hundred thirty-nine".