1672321 has 6 divisors (see below), whose sum is σ = 1945410. Its totient is φ = 1433376.

The previous prime is 1672301. The next prime is 1672331. The reversal of 1672321 is 1232761.

It can be written as a sum of positive squares in only one way, i.e., 1132096 + 540225 = 1064^2 + 735^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1672321 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

1672321 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1672292 and 1672301.

It is not an unprimeable number, because it can be changed into a prime (1672301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17016 + ... + 17113.

It is an arithmetic number, because the mean of its divisors is an integer number (324235).

2^1672321 is an apocalyptic number.

It is an amenable number.

1672321 is a deficient number, since it is larger than the sum of its proper divisors (273089).

1672321 is an equidigital number, since it uses as much as digits as its factorization.

1672321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34143 (or 34136 counting only the distinct ones).

The product of its digits is 504, while the sum is 22.

The square root of 1672321 is about 1293.1825083877. The cubic root of 1672321 is about 118.6970378784.

The spelling of 1672321 in words is "one million, six hundred seventy-two thousand, three hundred twenty-one".