1721130 has 32 divisors (see below), whose sum is σ = 4178304. Its totient is φ = 453696.

The previous prime is 1721123. The next prime is 1721143. The reversal of 1721130 is 311271.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2812 + ... + 3368.

It is an arithmetic number, because the mean of its divisors is an integer number (130572).

2^1721130 is an apocalyptic number.

1721130 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1721130 is an abundant number, since it is smaller than the sum of its proper divisors (2457174).

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

1721130 is a wasteful number, since it uses less digits than its factorization.

1721130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 670.

The product of its (nonzero) digits is 42, while the sum is 15.

The square root of 1721130 is about 1311.9184425870. The cubic root of 1721130 is about 119.8407610069.

The spelling of 1721130 in words is "one million, seven hundred twenty-one thousand, one hundred thirty".