1304400021 has 8 divisors (see below), whose sum is σ = 1841505984. Its totient is φ = 818447040.

The previous prime is 1304400011. The next prime is 1304400043. The reversal of 1304400021 is 1200044031.

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

It is not a de Polignac number, because 1304400021 - 2⁷ = 1304399893 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1304400011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12788185 + ... + 12788286.

It is an arithmetic number, because the mean of its divisors is an integer number (230188248).

Almost surely, 2^1304400021 is an apocalyptic number.

It is an amenable number.

1304400021 is a deficient number, since it is larger than the sum of its proper divisors (537105963).

1304400021 is a wasteful number, since it uses less digits than its factorization.

1304400021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25576491.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 1304400021 is about 36116.4785243523. The cubic root of 1304400021 is about 1092.6228174025.

Adding to 1304400021 its reverse (1200044031), we get a palindrome (2504444052).

The spelling of 1304400021 in words is "one billion, three hundred four million, four hundred thousand, twenty-one".