1389798 has 40 divisors (see below), whose sum is σ = 3258288. Its totient is φ = 441936.

The previous prime is 1389797. The next prime is 1389809. The reversal of 1389798 is 8979831.

It is a super-3 number, since 3×1389798³ = 8053344952633312776, which contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1389797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3540 + ... + 3912.

2^1389798 is an apocalyptic number.

1389798 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 1389798, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1629144).

1389798 is an abundant number, since it is smaller than the sum of its proper divisors (1868490).

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

1389798 is a wasteful number, since it uses less digits than its factorization.

1389798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410 (or 401 counting only the distinct ones).

The product of its digits is 108864, while the sum is 45.

The square root of 1389798 is about 1178.8969420607. The cubic root of 1389798 is about 111.5964965948.

It can be divided in two parts, 1389 and 798, that added together give a 7-th power (2187 = 3⁷).

The spelling of 1389798 in words is "one million, three hundred eighty-nine thousand, seven hundred ninety-eight".