398528269 has 4 divisors (see below), whose sum is σ = 398787100. Its totient is φ = 398269440.

The previous prime is 398528233. The next prime is 398528293. The reversal of 398528269 is 962825893.

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 79477225 + 319051044 = 8915^2 + 17862^2 .

It is a cyclic number.

It is not a de Polignac number, because 398528269 - 2¹⁵ = 398495501 is a prime.

It is a super-2 number, since 2×398528269² = 317649562384272722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398528869) 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, 127092 + ... + 130189.

It is an arithmetic number, because the mean of its divisors is an integer number (99696775).

Almost surely, 2^398528269 is an apocalyptic number.

It is an amenable number.

398528269 is a deficient number, since it is larger than the sum of its proper divisors (258831).

398528269 is a wasteful number, since it uses less digits than its factorization.

398528269 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258830.

The product of its digits is 1866240, while the sum is 52.

The square root of 398528269 is about 19963.1728189684. The cubic root of 398528269 is about 735.9015386214.

The spelling of 398528269 in words is "three hundred ninety-eight million, five hundred twenty-eight thousand, two hundred sixty-nine".