3998567789 has 2 divisors, whose sum is σ = 3998567790. Its totient is φ = 3998567788.

The previous prime is 3998567753. The next prime is 3998567809. The reversal of 3998567789 is 9877658993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3753645289 + 244922500 = 61267^2 + 15650^2 .

It is an emirp because it is prime and its reverse (9877658993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3998567789 - 2⁸ = 3998567533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3998597789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1999283894 + 1999283895.

It is an arithmetic number, because the mean of its divisors is an integer number (1999283895).

Almost surely, 2^3998567789 is an apocalyptic number.

It is an amenable number.

3998567789 is a deficient number, since it is larger than the sum of its proper divisors (1).

3998567789 is an equidigital number, since it uses as much as digits as its factorization.

3998567789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 205752960, while the sum is 71.

The square root of 3998567789 is about 63234.2295675372. The cubic root of 3998567789 is about 1587.2115715811.

It can be divided in two parts, 3998 and 567789, that added together give a cube (571787 = 83³).

The spelling of 3998567789 in words is "three billion, nine hundred ninety-eight million, five hundred sixty-seven thousand, seven hundred eighty-nine".