398426565 has 8 divisors (see below), whose sum is σ = 637482528. Its totient is φ = 212494160.

The previous prime is 398426533. The next prime is 398426597. The reversal of 398426565 is 565624893.

It is an interprime number because it is at equal distance from previous prime (398426533) and next prime (398426597).

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

It is not a de Polignac number, because 398426565 - 2⁵ = 398426533 is a prime.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 13280871 + ... + 13280900.

It is an arithmetic number, because the mean of its divisors is an integer number (79685316).

Almost surely, 2^398426565 is an apocalyptic number.

It is an amenable number.

398426565 is a deficient number, since it is larger than the sum of its proper divisors (239055963).

398426565 is a wasteful number, since it uses less digits than its factorization.

398426565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26561779.

The product of its digits is 1555200, while the sum is 48.

The square root of 398426565 is about 19960.6253659548. The cubic root of 398426565 is about 735.8389328596.

The spelling of 398426565 in words is "three hundred ninety-eight million, four hundred twenty-six thousand, five hundred sixty-five".