1304021 has 4 divisors (see below), whose sum is σ = 1323552. Its totient is φ = 1284492.

The previous prime is 1304003. The next prime is 1304029. The reversal of 1304021 is 1204031.

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: 1204031 = 521 ⋅2311.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1304021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1303993 and 1304011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1304029) 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 3 ways as a sum of consecutive naturals, for example, 9665 + ... + 9798.

It is an arithmetic number, because the mean of its divisors is an integer number (330888).

2^1304021 is an apocalyptic number.

It is an amenable number.

1304021 is a deficient number, since it is larger than the sum of its proper divisors (19531).

1304021 is an equidigital number, since it uses as much as digits as its factorization.

1304021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19530.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 1304021 is about 1141.9373888266. The cubic root of 1304021 is about 109.2516978932.

Adding to 1304021 its reverse (1204031), we get a palindrome (2508052).

The spelling of 1304021 in words is "one million, three hundred four thousand, twenty-one".