39894053989 has 2 divisors, whose sum is σ = 39894053990. Its totient is φ = 39894053988.

The previous prime is 39894053981. The next prime is 39894054029. The reversal of 39894053989 is 98935049893.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34009629889 + 5884424100 = 184417^2 + 76710^2 .

It is an emirp because it is prime and its reverse (98935049893) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 39894053989 - 2³ = 39894053981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39894053981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19947026994 + 19947026995.

It is an arithmetic number, because the mean of its divisors is an integer number (19947026995).

Almost surely, 2^39894053989 is an apocalyptic number.

It is an amenable number.

39894053989 is a deficient number, since it is larger than the sum of its proper divisors (1).

39894053989 is an equidigital number, since it uses as much as digits as its factorization.

39894053989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 75582720, while the sum is 67.

It can be divided in two parts, 398940 and 53989, that added together give a square (452929 = 673²).

The spelling of 39894053989 in words is "thirty-nine billion, eight hundred ninety-four million, fifty-three thousand, nine hundred eighty-nine".