398175091 has 4 divisors (see below), whose sum is σ = 401039800. Its totient is φ = 395310384.

The previous prime is 398175083. The next prime is 398175101. The reversal of 398175091 is 190571893.

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

It is a cyclic number.

It is not a de Polignac number, because 398175091 - 2³ = 398175083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (398175391) 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, 1432146 + ... + 1432423.

It is an arithmetic number, because the mean of its divisors is an integer number (100259950).

Almost surely, 2^398175091 is an apocalyptic number.

398175091 is a deficient number, since it is larger than the sum of its proper divisors (2864709).

398175091 is a wasteful number, since it uses less digits than its factorization.

398175091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2864708.

The product of its (nonzero) digits is 68040, while the sum is 43.

The square root of 398175091 is about 19954.3251201337. The cubic root of 398175091 is about 735.6840876751.

The spelling of 398175091 in words is "three hundred ninety-eight million, one hundred seventy-five thousand, ninety-one".