1989479358947 has 2 divisors, whose sum is σ = 1989479358948. Its totient is φ = 1989479358946.

The previous prime is 1989479358931. The next prime is 1989479358983. The reversal of 1989479358947 is 7498539749891.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1989479358947 - 2⁴ = 1989479358931 is a prime.

It is not a weakly prime, because it can be changed into another prime (1989479358907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 994739679473 + 994739679474.

It is an arithmetic number, because the mean of its divisors is an integer number (994739679474).

Almost surely, 2^{1989479358947} is an apocalyptic number.

1989479358947 is a deficient number, since it is larger than the sum of its proper divisors (1).

1989479358947 is an equidigital number, since it uses as much as digits as its factorization.

1989479358947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4938071040, while the sum is 83.

The spelling of 1989479358947 in words is "one trillion, nine hundred eighty-nine billion, four hundred seventy-nine million, three hundred fifty-eight thousand, nine hundred forty-seven".