1382721 has 4 divisors (see below), whose sum is σ = 1843632. Its totient is φ = 921812.

The previous prime is 1382681. The next prime is 1382753. The reversal of 1382721 is 1272831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1382721 - 2¹⁰ = 1381697 is a prime.

It is a D-number.

It is a junction number, because it is equal to n+sod(n) for n = 1382691 and 1382700.

It is not an unprimeable number, because it can be changed into a prime (1382021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 230451 + ... + 230456.

It is an arithmetic number, because the mean of its divisors is an integer number (460908).

2^1382721 is an apocalyptic number.

It is an amenable number.

1382721 is a deficient number, since it is larger than the sum of its proper divisors (460911).

1382721 is an equidigital number, since it uses as much as digits as its factorization.

1382721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 460910.

The product of its digits is 672, while the sum is 24.

The square root of 1382721 is about 1175.8915766345. The cubic root of 1382721 is about 111.4067537353.

The spelling of 1382721 in words is "one million, three hundred eighty-two thousand, seven hundred twenty-one".