1799980 has 96 divisors (see below), whose sum is σ = 4967424. Its totient is φ = 532224.

The previous prime is 1799969. The next prime is 1799983. The reversal of 1799980 is 899971.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is not an unprimeable number, because it can be changed into a prime (1799983) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 41839 + ... + 41881.

It is an arithmetic number, because the mean of its divisors is an integer number (51744).

2^1799980 is an apocalyptic number.

1799980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1799980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2483712).

1799980 is an abundant number, since it is smaller than the sum of its proper divisors (3167444).

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

1799980 is a wasteful number, since it uses less digits than its factorization.

1799980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95 (or 93 counting only the distinct ones).

The product of its (nonzero) digits is 40824, while the sum is 43.

The square root of 1799980 is about 1341.6333329192. The cubic root of 1799980 is about 121.6435893763.

Subtracting from 1799980 its reverse (899971), we obtain a palindrome (900009).

The spelling of 1799980 in words is "one million, seven hundred ninety-nine thousand, nine hundred eighty".