1305121304 has 8 divisors (see below), whose sum is σ = 2447102460. Its totient is φ = 652560648.

The previous prime is 1305121303. The next prime is 1305121309. The reversal of 1305121304 is 4031215031.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1305121303) 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 as a sum of consecutive naturals, namely, 81570074 + ... + 81570089.

Almost surely, 2^1305121304 is an apocalyptic number.

It is an amenable number.

1305121304 is a deficient number, since it is larger than the sum of its proper divisors (1141981156).

1305121304 is a wasteful number, since it uses less digits than its factorization.

1305121304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163140169 (or 163140165 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 1305121304 is about 36126.4626555106. The cubic root of 1305121304 is about 1092.8241730792.

Adding to 1305121304 its reverse (4031215031), we get a palindrome (5336336335).

The spelling of 1305121304 in words is "one billion, three hundred five million, one hundred twenty-one thousand, three hundred four".