398040767989 has 2 divisors, whose sum is σ = 398040767990. Its totient is φ = 398040767988.

The previous prime is 398040767977. The next prime is 398040768023. The reversal of 398040767989 is 989767040893.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 276194393764 + 121846374225 = 525542^2 + 349065^2 .

It is a cyclic number.

It is not a de Polignac number, because 398040767989 - 2⁹ = 398040767477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398040768989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199020383994 + 199020383995.

It is an arithmetic number, because the mean of its divisors is an integer number (199020383995).

Almost surely, 2^398040767989 is an apocalyptic number.

It is an amenable number.

398040767989 is a deficient number, since it is larger than the sum of its proper divisors (1).

398040767989 is an equidigital number, since it uses as much as digits as its factorization.

398040767989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 164602368, while the sum is 70.

The spelling of 398040767989 in words is "three hundred ninety-eight billion, forty million, seven hundred sixty-seven thousand, nine hundred eighty-nine".