1989398 has 4 divisors (see below), whose sum is σ = 2984100. Its totient is φ = 994698.

The previous prime is 1989353. The next prime is 1989401. The reversal of 1989398 is 8939891.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 497348 + ... + 497351.

It is an arithmetic number, because the mean of its divisors is an integer number (746025).

2^1989398 is an apocalyptic number.

1989398 is a deficient number, since it is larger than the sum of its proper divisors (994702).

1989398 is an equidigital number, since it uses as much as digits as its factorization.

1989398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 994701.

The product of its digits is 139968, while the sum is 47.

The square root of 1989398 is about 1410.4602085844. The cubic root of 1989398 is about 125.7690823936.

It can be divided in two parts, 19893 and 98, that added together give a palindrome (19991).

The spelling of 1989398 in words is "one million, nine hundred eighty-nine thousand, three hundred ninety-eight".