398434275569 has 4 divisors (see below), whose sum is σ = 434655573360. Its totient is φ = 362212977780.

The previous prime is 398434275563. The next prime is 398434275581. The reversal of 398434275569 is 965572434893.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 398434275569 - 2¹⁶ = 398434210033 is a prime.

It is a super-2 number, since 2×398434275569² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (398434275563) 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, 18110648879 + ... + 18110648900.

It is an arithmetic number, because the mean of its divisors is an integer number (108663893340).

Almost surely, 2^398434275569 is an apocalyptic number.

It is an amenable number.

398434275569 is a deficient number, since it is larger than the sum of its proper divisors (36221297791).

398434275569 is a wasteful number, since it uses less digits than its factorization.

398434275569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36221297790.

The product of its digits is 195955200, while the sum is 65.

The spelling of 398434275569 in words is "three hundred ninety-eight billion, four hundred thirty-four million, two hundred seventy-five thousand, five hundred sixty-nine".