1304400005 has 4 divisors (see below), whose sum is σ = 1565280012. Its totient is φ = 1043520000.

The previous prime is 1304399981. The next prime is 1304400007. The reversal of 1304400005 is 5000044031.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 511076449 + 793323556 = 22607^2 + 28166^2 .

It is not a de Polignac number, because 1304400005 - 2¹² = 1304395909 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1304400007) 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, 130439996 + ... + 130440005.

It is an arithmetic number, because the mean of its divisors is an integer number (391320003).

Almost surely, 2^1304400005 is an apocalyptic number.

It is an amenable number.

1304400005 is a deficient number, since it is larger than the sum of its proper divisors (260880007).

1304400005 is an equidigital number, since it uses as much as digits as its factorization.

1304400005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260880006.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 1304400005 is about 36116.4783028467. The cubic root of 1304400005 is about 1092.6228129350.

Adding to 1304400005 its reverse (5000044031), we get a palindrome (6304444036).

The spelling of 1304400005 in words is "one billion, three hundred four million, four hundred thousand, five".