398098907 has 4 divisors (see below), whose sum is σ = 399807720. Its totient is φ = 396390096.

The previous prime is 398098891. The next prime is 398098937. The reversal of 398098907 is 709890893.

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 398098907 - 2⁴ = 398098891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (398098937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 854057 + ... + 854522.

It is an arithmetic number, because the mean of its divisors is an integer number (99951930).

Almost surely, 2^398098907 is an apocalyptic number.

398098907 is a deficient number, since it is larger than the sum of its proper divisors (1708813).

398098907 is a wasteful number, since it uses less digits than its factorization.

398098907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1708812.

The product of its (nonzero) digits is 979776, while the sum is 53.

The square root of 398098907 is about 19952.4160692383. The cubic root of 398098907 is about 735.6371644892.

The spelling of 398098907 in words is "three hundred ninety-eight million, ninety-eight thousand, nine hundred seven".