398193291 has 12 divisors (see below), whose sum is σ = 578833632. Its totient is φ = 263770416.

The previous prime is 398193281. The next prime is 398193307. The reversal of 398193291 is 192391893.

It is a happy number.

It is not a de Polignac number, because 398193291 - 2¹¹ = 398191243 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (398193221) 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 11 ways as a sum of consecutive naturals, for example, 139491 + ... + 142316.

It is an arithmetic number, because the mean of its divisors is an integer number (48236136).

Almost surely, 2^398193291 is an apocalyptic number.

398193291 is a deficient number, since it is larger than the sum of its proper divisors (180640341).

398193291 is a wasteful number, since it uses less digits than its factorization.

398193291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281970 (or 281967 counting only the distinct ones).

The product of its digits is 104976, while the sum is 45.

The square root of 398193291 is about 19954.7811564046. The cubic root of 398193291 is about 735.6952965183.

The spelling of 398193291 in words is "three hundred ninety-eight million, one hundred ninety-three thousand, two hundred ninety-one".