2073721 has 8 divisors (see below), whose sum is σ = 2245320. Its totient is φ = 1903872.

The previous prime is 2073719. The next prime is 2073787. The reversal of 2073721 is 1273702.

It can be written as a sum of positive squares in 4 ways, for example, as 121 + 2073600 = 11^2 + 1440^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2073721 - 2¹ = 2073719 is a prime.

It is a Duffinian number.

2073721 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 2073692 and 2073701.

It is not an unprimeable number, because it can be changed into a prime (2073121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3201 + ... + 3793.

It is an arithmetic number, because the mean of its divisors is an integer number (280665).

2^2073721 is an apocalyptic number.

It is an amenable number.

2073721 is a deficient number, since it is larger than the sum of its proper divisors (171599).

2073721 is a wasteful number, since it uses less digits than its factorization.

2073721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 875.

The product of its (nonzero) digits is 588, while the sum is 22.

The square root of 2073721 is about 1440.0420132760. The cubic root of 2073721 is about 127.5215086103.

The spelling of 2073721 in words is "two million, seventy-three thousand, seven hundred twenty-one".