1791980 has 12 divisors (see below), whose sum is σ = 3763200. Its totient is φ = 716784.

The previous prime is 1791973. The next prime is 1791989. The reversal of 1791980 is 891971.

It is a super-2 number, since 2×1791980² = 6422384640800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1791980.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1791989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44780 + ... + 44819.

It is an arithmetic number, because the mean of its divisors is an integer number (313600).

2^1791980 is an apocalyptic number.

1791980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1791980 is an abundant number, since it is smaller than the sum of its proper divisors (1971220).

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

1791980 is a wasteful number, since it uses less digits than its factorization.

1791980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89608 (or 89606 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 35.

The square root of 1791980 is about 1338.6485722549. The cubic root of 1791980 is about 121.4631070000.

Subtracting from 1791980 its reverse (891971), we obtain a palindrome (900009).

The spelling of 1791980 in words is "one million, seven hundred ninety-one thousand, nine hundred eighty".