398241891 has 12 divisors (see below), whose sum is σ = 595074480. Its totient is φ = 256339440.

The previous prime is 398241863. The next prime is 398241929. The reversal of 398241891 is 198142893.

It is not a de Polignac number, because 398241891 - 2¹³ = 398233699 is a prime.

It is not an unprimeable number, because it can be changed into a prime (398241191) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 762655 + ... + 763176.

It is an arithmetic number, because the mean of its divisors is an integer number (49589540).

Almost surely, 2^398241891 is an apocalyptic number.

398241891 is a deficient number, since it is larger than the sum of its proper divisors (196832589).

398241891 is a wasteful number, since it uses less digits than its factorization.

398241891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1525866 (or 1525863 counting only the distinct ones).

The product of its digits is 124416, while the sum is 45.

The square root of 398241891 is about 19955.9988725195. The cubic root of 398241891 is about 735.7252261510.

Adding to 398241891 its sum of digits (45), we get a square (398241936 = 19956²).

The spelling of 398241891 in words is "three hundred ninety-eight million, two hundred forty-one thousand, eight hundred ninety-one".