398720569 has 8 divisors (see below), whose sum is σ = 430242120. Its totient is φ = 367320576.

The previous prime is 398720561. The next prime is 398720591. The reversal of 398720569 is 965027893.

It can be written as a sum of positive squares in 4 ways, for example, as 101606400 + 297114169 = 10080^2 + 17237^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 398720569 - 2³ = 398720561 is a prime.

It is a super-2 number, since 2×398720569² = 317956184287367522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (398720561) 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 in 7 ways as a sum of consecutive naturals, for example, 23512 + ... + 36745.

It is an arithmetic number, because the mean of its divisors is an integer number (53780265).

Almost surely, 2^398720569 is an apocalyptic number.

It is an amenable number.

398720569 is a deficient number, since it is larger than the sum of its proper divisors (31521551).

398720569 is a wasteful number, since it uses less digits than its factorization.

398720569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60779.

The product of its (nonzero) digits is 816480, while the sum is 49.

The square root of 398720569 is about 19967.9886067676. The cubic root of 398720569 is about 736.0198833091.

The spelling of 398720569 in words is "three hundred ninety-eight million, seven hundred twenty thousand, five hundred sixty-nine".