1304721 has 32 divisors (see below), whose sum is σ = 2211840. Its totient is φ = 752400.

The previous prime is 1304713. The next prime is 1304741. The reversal of 1304721 is 1274031.

It is not a de Polignac number, because 1304721 - 2³ = 1304713 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1304694 and 1304703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1304741) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6736 + ... + 6926.

It is an arithmetic number, because the mean of its divisors is an integer number (69120).

2^1304721 is an apocalyptic number.

1304721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1304721 is a deficient number, since it is larger than the sum of its proper divisors (907119).

1304721 is a wasteful number, since it uses less digits than its factorization.

1304721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234 (or 228 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 1304721 is about 1142.2438443695. The cubic root of 1304721 is about 109.2712432094.

Adding to 1304721 its reverse (1274031), we get a palindrome (2578752).

It can be divided in two parts, 1304 and 721, that added together give a square (2025 = 45²).

The spelling of 1304721 in words is "one million, three hundred four thousand, seven hundred twenty-one".