398955788 has 48 divisors (see below), whose sum is σ = 883486464. Its totient is φ = 153109440.

The previous prime is 398955701. The next prime is 398955803. The reversal of 398955788 is 887559893.

It is a self number, because there is not a number n which added to its sum of digits gives 398955788.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10970 + ... + 30302.

It is an arithmetic number, because the mean of its divisors is an integer number (18405968).

Almost surely, 2^398955788 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 398955788, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (441743232).

398955788 is an abundant number, since it is smaller than the sum of its proper divisors (484530676).

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

398955788 is a wasteful number, since it uses less digits than its factorization.

398955788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19422 (or 19420 counting only the distinct ones).

The product of its digits is 21772800, while the sum is 62.

The square root of 398955788 is about 19973.8776405584. The cubic root of 398955788 is about 736.1645893524.

The spelling of 398955788 in words is "three hundred ninety-eight million, nine hundred fifty-five thousand, seven hundred eighty-eight".