398136265 has 16 divisors (see below), whose sum is σ = 487587600. Its totient is φ = 311980032.

The previous prime is 398136259. The next prime is 398136283. The reversal of 398136265 is 562631893.

It can be written as a sum of positive squares in 8 ways, for example, as 16949689 + 381186576 = 4117^2 + 19524^2 .

It is a cyclic number.

It is not a de Polignac number, because 398136265 - 2³ = 398136257 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 266641 + ... + 268129.

It is an arithmetic number, because the mean of its divisors is an integer number (30474225).

Almost surely, 2^398136265 is an apocalyptic number.

It is an amenable number.

398136265 is a deficient number, since it is larger than the sum of its proper divisors (89451335).

398136265 is a wasteful number, since it uses less digits than its factorization.

398136265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2556.

The product of its digits is 233280, while the sum is 43.

The square root of 398136265 is about 19953.3522246263. The cubic root of 398136265 is about 735.6601747455.

The spelling of 398136265 in words is "three hundred ninety-eight million, one hundred thirty-six thousand, two hundred sixty-five".