1721030 has 16 divisors (see below), whose sum is σ = 3151440. Its totient is φ = 676512.

The previous prime is 1721023. The next prime is 1721081. The reversal of 1721030 is 301271.

It is a junction number, because it is equal to n+sod(n) for n = 1720996 and 1721014.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 869 + ... + 2048.

It is an arithmetic number, because the mean of its divisors is an integer number (196965).

2^1721030 is an apocalyptic number.

1721030 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1721030 is a deficient number, since it is larger than the sum of its proper divisors (1430410).

1721030 is a wasteful number, since it uses less digits than its factorization.

1721030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2983.

The product of its (nonzero) digits is 42, while the sum is 14.

The square root of 1721030 is about 1311.8803299082. The cubic root of 1721030 is about 119.8384399914.

The spelling of 1721030 in words is "one million, seven hundred twenty-one thousand, thirty".