1789998 has 64 divisors (see below), whose sum is σ = 4561920. Its totient is φ = 456192.

The previous prime is 1789993. The next prime is 1789999. The reversal of 1789998 is 8999871.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a self number, because there is not a number n which added to its sum of digits gives 1789998.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1789993) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16368 + ... + 16476.

It is an arithmetic number, because the mean of its divisors is an integer number (71280).

2^1789998 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1789998, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2280960).

1789998 is an abundant number, since it is smaller than the sum of its proper divisors (2771922).

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

1789998 is a wasteful number, since it uses less digits than its factorization.

1789998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161.

The product of its digits is 326592, while the sum is 51.

The square root of 1789998 is about 1337.9080685907. The cubic root of 1789998 is about 121.4183094969.

The spelling of 1789998 in words is "one million, seven hundred eighty-nine thousand, nine hundred ninety-eight".