39981489473 has 2 divisors, whose sum is σ = 39981489474. Its totient is φ = 39981489472.

The previous prime is 39981489469. The next prime is 39981489547. The reversal of 39981489473 is 37498418993.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30605053249 + 9376436224 = 174943^2 + 96832^2 .

It is a cyclic number.

It is not a de Polignac number, because 39981489473 - 2² = 39981489469 is a prime.

It is not a weakly prime, because it can be changed into another prime (39981489673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19990744736 + 19990744737.

It is an arithmetic number, because the mean of its divisors is an integer number (19990744737).

Almost surely, 2^39981489473 is an apocalyptic number.

It is an amenable number.

39981489473 is a deficient number, since it is larger than the sum of its proper divisors (1).

39981489473 is an equidigital number, since it uses as much as digits as its factorization.

39981489473 is an evil number, because the sum of its binary digits is even.

The product of its digits is 47029248, while the sum is 65.

The spelling of 39981489473 in words is "thirty-nine billion, nine hundred eighty-one million, four hundred eighty-nine thousand, four hundred seventy-three".