398317769 has 4 divisors (see below), whose sum is σ = 421748244. Its totient is φ = 374887296.

The previous prime is 398317753. The next prime is 398317771. The reversal of 398317769 is 967713893.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 109725625 + 288592144 = 10475^2 + 16988^2 .

It is a cyclic number.

It is not a de Polignac number, because 398317769 - 2⁴ = 398317753 is a prime.

It is a super-2 number, since 2×398317769² = 317314090202274722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 398317769.

It is not an unprimeable number, because it can be changed into a prime (398317169) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11715212 + ... + 11715245.

It is an arithmetic number, because the mean of its divisors is an integer number (105437061).

Almost surely, 2^398317769 is an apocalyptic number.

It is an amenable number.

398317769 is a deficient number, since it is larger than the sum of its proper divisors (23430475).

398317769 is a wasteful number, since it uses less digits than its factorization.

398317769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23430474.

The product of its digits is 1714608, while the sum is 53.

The square root of 398317769 is about 19957.8999145702. The cubic root of 398317769 is about 735.7719496917.

The spelling of 398317769 in words is "three hundred ninety-eight million, three hundred seventeen thousand, seven hundred sixty-nine".