398258391 has 4 divisors (see below), whose sum is σ = 531011192. Its totient is φ = 265505592.

The previous prime is 398258381. The next prime is 398258431. The reversal of 398258391 is 193852893.

It is a happy number.

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

It is not a de Polignac number, because 398258391 - 2⁵ = 398258359 is a prime.

It is a super-4 number, since 4×398258391⁴ (a number of 36 digits) contains 4444 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 398258391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398258351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66376396 + ... + 66376401.

It is an arithmetic number, because the mean of its divisors is an integer number (132752798).

Almost surely, 2^398258391 is an apocalyptic number.

398258391 is a deficient number, since it is larger than the sum of its proper divisors (132752801).

398258391 is a wasteful number, since it uses less digits than its factorization.

398258391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132752800.

The product of its digits is 466560, while the sum is 48.

The square root of 398258391 is about 19956.4122777618. The cubic root of 398258391 is about 735.7353868924.

The spelling of 398258391 in words is "three hundred ninety-eight million, two hundred fifty-eight thousand, three hundred ninety-one".