1302721 has 4 divisors (see below), whose sum is σ = 1488832. Its totient is φ = 1116612.

The previous prime is 1302701. The next prime is 1302737. The reversal of 1302721 is 1272031.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1272031 = 19 ⋅66949.

It is not a de Polignac number, because 1302721 - 2⁵ = 1302689 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1302695 and 1302704.

It is not an unprimeable number, because it can be changed into a prime (1302701) 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, 93045 + ... + 93058.

It is an arithmetic number, because the mean of its divisors is an integer number (372208).

2^1302721 is an apocalyptic number.

It is an amenable number.

1302721 is a deficient number, since it is larger than the sum of its proper divisors (186111).

1302721 is an equidigital number, since it uses as much as digits as its factorization.

1302721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186110.

The product of its (nonzero) digits is 84, while the sum is 16.

The square root of 1302721 is about 1141.3680388026. The cubic root of 1302721 is about 109.2153808835.

Adding to 1302721 its reverse (1272031), we get a palindrome (2574752).

The spelling of 1302721 in words is "one million, three hundred two thousand, seven hundred twenty-one".