398181871 has 8 divisors (see below), whose sum is σ = 427898160. Its totient is φ = 369164928.

The previous prime is 398181859. The next prime is 398181877. The reversal of 398181871 is 178181893.

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

It is not a de Polignac number, because 398181871 - 2¹⁷ = 398050799 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398181877) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 173656 + ... + 175933.

It is an arithmetic number, because the mean of its divisors is an integer number (53487270).

Almost surely, 2^398181871 is an apocalyptic number.

398181871 is a deficient number, since it is larger than the sum of its proper divisors (29716289).

398181871 is a wasteful number, since it uses less digits than its factorization.

398181871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349673.

The product of its digits is 96768, while the sum is 46.

The square root of 398181871 is about 19954.4950073912. The cubic root of 398181871 is about 735.6882633171.

The spelling of 398181871 in words is "three hundred ninety-eight million, one hundred eighty-one thousand, eight hundred seventy-one".