1989403398 has 48 divisors (see below), whose sum is σ = 4560192000. Its totient is φ = 625054320.

The previous prime is 1989403391. The next prime is 1989403411. The reversal of 1989403398 is 8933049891.

1989403398 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1989403391) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 53443 + ... + 82673.

It is an arithmetic number, because the mean of its divisors is an integer number (95004000).

Almost surely, 2^1989403398 is an apocalyptic number.

1989403398 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1989403398, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2280096000).

1989403398 is an abundant number, since it is smaller than the sum of its proper divisors (2570788602).

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

1989403398 is a wasteful number, since it uses less digits than its factorization.

1989403398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29457 (or 29454 counting only the distinct ones).

The product of its (nonzero) digits is 1679616, while the sum is 54.

The square root of 1989403398 is about 44602.7285936634. The cubic root of 1989403398 is about 1257.6919614674.

The spelling of 1989403398 in words is "one billion, nine hundred eighty-nine million, four hundred three thousand, three hundred ninety-eight".