398888893 has 4 divisors (see below), whose sum is σ = 429572668. Its totient is φ = 368205120.

The previous prime is 398888887. The next prime is 398888899.

398888893 is nontrivially palindromic in base 10.

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

It is an interprime number because it is at equal distance from previous prime (398888887) and next prime (398888899).

It can be written as a sum of positive squares in 2 ways, for example, as 128187684 + 270701209 = 11322^2 + 16453^2 .

It is a cyclic number.

It is not a de Polignac number, because 398888893 - 2⁹ = 398888381 is a prime.

It is a super-2 number, since 2×398888893² = 318224697917530898, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398888899) 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 3 ways as a sum of consecutive naturals, for example, 15341868 + ... + 15341893.

It is an arithmetic number, because the mean of its divisors is an integer number (107393167).

Almost surely, 2^398888893 is an apocalyptic number.

It is an amenable number.

398888893 is a deficient number, since it is larger than the sum of its proper divisors (30683775).

398888893 is a wasteful number, since it uses less digits than its factorization.

398888893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30683774.

The product of its digits is 23887872, while the sum is 64.

The square root of 398888893 is about 19972.2030081811. The cubic root of 398888893 is about 736.1234415324.

The spelling of 398888893 in words is "three hundred ninety-eight million, eight hundred eighty-eight thousand, eight hundred ninety-three".