1721124 has 18 divisors (see below), whose sum is σ = 4350710. Its totient is φ = 573696.

The previous prime is 1721123. The next prime is 1721143. The reversal of 1721124 is 4211271.

It can be written as a sum of positive squares in only one way, i.e., 1065024 + 656100 = 1032^2 + 810^2 .

It is a tau number, because it is divible by the number of its divisors (18).

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

It is a junction number, because it is equal to n+sod(n) for n = 1721097 and 1721106.

It is not an unprimeable number, because it can be changed into a prime (1721123) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 23869 + ... + 23940.

2^1721124 is an apocalyptic number.

It is an amenable number.

1721124 is an abundant number, since it is smaller than the sum of its proper divisors (2629586).

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

1721124 is a wasteful number, since it uses less digits than its factorization.

1721124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47819 (or 47814 counting only the distinct ones).

The product of its digits is 112, while the sum is 18.

The square root of 1721124 is about 1311.9161558575. The cubic root of 1721124 is about 119.8406217485.

Adding to 1721124 its reverse (4211271), we get a palindrome (5932395).

It can be divided in two parts, 172 and 1124, that added together give a 4-th power (1296 = 6⁴).

The spelling of 1721124 in words is "one million, seven hundred twenty-one thousand, one hundred twenty-four".