1729980 has 72 divisors (see below), whose sum is σ = 6001632. Its totient is φ = 395136.

The previous prime is 1729961. The next prime is 1730041. The reversal of 1729980 is 899271.

It is a happy number.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 574 + ... + 1946.

It is an arithmetic number, because the mean of its divisors is an integer number (83356).

2^1729980 is an apocalyptic number.

1729980 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 1729980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3000816).

1729980 is an abundant number, since it is smaller than the sum of its proper divisors (4271652).

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

1729980 is a wasteful number, since it uses less digits than its factorization.

1729980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1395 (or 1390 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 1729980 is about 1315.2870409154. The cubic root of 1729980 is about 120.0458158387.

The spelling of 1729980 in words is "one million, seven hundred twenty-nine thousand, nine hundred eighty".