398968291 has 4 divisors (see below), whose sum is σ = 422437032. Its totient is φ = 375499552.

The previous prime is 398968247. The next prime is 398968307. The reversal of 398968291 is 192869893.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-398968291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (398968391) 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, 11734345 + ... + 11734378.

It is an arithmetic number, because the mean of its divisors is an integer number (105609258).

Almost surely, 2^398968291 is an apocalyptic number.

398968291 is a deficient number, since it is larger than the sum of its proper divisors (23468741).

398968291 is a wasteful number, since it uses less digits than its factorization.

398968291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23468740.

The product of its digits is 1679616, while the sum is 55.

The square root of 398968291 is about 19974.1906219001. The cubic root of 398968291 is about 736.1722795694.

The spelling of 398968291 in words is "three hundred ninety-eight million, nine hundred sixty-eight thousand, two hundred ninety-one".