1721160 has 96 divisors (see below), whose sum is σ = 6402240. Its totient is φ = 392832.

The previous prime is 1721149. The next prime is 1721183. The reversal of 1721160 is 611271.

1721160 = T₂₂₅ + T₂₂₆ + ... + T₂₇₈.

It is a Harshad number since it is a multiple of its sum of digits (18).

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, 2179 + ... + 2861.

It is an arithmetic number, because the mean of its divisors is an integer number (66690).

2^1721160 is an apocalyptic number.

1721160 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 1721160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3201120).

1721160 is an abundant number, since it is smaller than the sum of its proper divisors (4681080).

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

1721160 is a wasteful number, since it uses less digits than its factorization.

1721160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 707 (or 700 counting only the distinct ones).

The product of its (nonzero) digits is 84, while the sum is 18.

The square root of 1721160 is about 1311.9298761748. The cubic root of 1721160 is about 119.8414572940.

It can be divided in two parts, 17211 and 60, that added together give a palindrome (17271).

The spelling of 1721160 in words is "one million, seven hundred twenty-one thousand, one hundred sixty".