398989900 has 36 divisors (see below), whose sum is σ = 870850512. Its totient is φ = 158666560.

The previous prime is 398989861. The next prime is 398989957. The reversal of 398989900 is 9989893.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5769 + ... + 28831.

It is an arithmetic number, because the mean of its divisors is an integer number (24190292).

Almost surely, 2^398989900 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 398989900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (435425256).

398989900 is an abundant number, since it is smaller than the sum of its proper divisors (471860612).

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

398989900 is a wasteful number, since it uses less digits than its factorization.

398989900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23250 (or 23243 counting only the distinct ones).

The product of its (nonzero) digits is 1259712, while the sum is 55.

The square root of 398989900 is about 19974.7315376202. The cubic root of 398989900 is about 736.1855702326.

The spelling of 398989900 in words is "three hundred ninety-eight million, nine hundred eighty-nine thousand, nine hundred".