398546388 has 54 divisors (see below), whose sum is σ = 1036559706. Its totient is φ = 129021984.

The previous prime is 398546387. The next prime is 398546441. The reversal of 398546388 is 883645893.

It is a happy number.

398546388 is a `hidden beast` number, since 3 + 98 + 546 + 3 + 8 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 387774864 + 10771524 = 19692^2 + 3282^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398546383) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 728331 + ... + 728877.

Almost surely, 2^398546388 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 398546388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (518279853).

398546388 is an abundant number, since it is smaller than the sum of its proper divisors (638013318).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

398546388 is a wasteful number, since it uses less digits than its factorization.

398546388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1141 (or 589 counting only the distinct ones).

The product of its digits is 4976640, while the sum is 54.

The square root of 398546388 is about 19963.6266244388. The cubic root of 398546388 is about 735.9126909862.

The spelling of 398546388 in words is "three hundred ninety-eight million, five hundred forty-six thousand, three hundred eighty-eight".