398936889 has 24 divisors (see below), whose sum is σ = 630753032. Its totient is φ = 241470720.

The previous prime is 398936831. The next prime is 398936891. The reversal of 398936889 is 988639893.

It can be written as a sum of positive squares in 4 ways, for example, as 2250000 + 396686889 = 1500^2 + 19917^2 .

It is not a de Polignac number, because 398936889 - 2¹³ = 398928697 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (398936809) 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 23 ways as a sum of consecutive naturals, for example, 20812 + ... + 35085.

Almost surely, 2^398936889 is an apocalyptic number.

398936889 is a gapful number since it is divisible by the number (39) formed by its first and last digit.

It is an amenable number.

398936889 is a deficient number, since it is larger than the sum of its proper divisors (231816143).

398936889 is a wasteful number, since it uses less digits than its factorization.

398936889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55977 (or 55974 counting only the distinct ones).

The product of its digits is 20155392, while the sum is 63.

The square root of 398936889 is about 19973.4045420404. The cubic root of 398936889 is about 736.1529648444.

The spelling of 398936889 in words is "three hundred ninety-eight million, nine hundred thirty-six thousand, eight hundred eighty-nine".