1989479358943 has 8 divisors (see below), whose sum is σ = 2005769365376. Its totient is φ = 1973230335000.

The previous prime is 1989479358931. The next prime is 1989479358947. The reversal of 1989479358943 is 3498539749891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1989479358943 - 2¹⁷ = 1989479227871 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 (1989479358947) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10148133 + ... + 10342318.

It is an arithmetic number, because the mean of its divisors is an integer number (250721170672).

Almost surely, 2^{1989479358943} is an apocalyptic number.

1989479358943 is a deficient number, since it is larger than the sum of its proper divisors (16290006433).

1989479358943 is a wasteful number, since it uses less digits than its factorization.

1989479358943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20491245.

The product of its digits is 2116316160, while the sum is 79.

The spelling of 1989479358943 in words is "one trillion, nine hundred eighty-nine billion, four hundred seventy-nine million, three hundred fifty-eight thousand, nine hundred forty-three".