1305604540 has 24 divisors (see below), whose sum is σ = 2800107072. Its totient is φ = 511129920.

The previous prime is 1305604537. The next prime is 1305604543. The reversal of 1305604540 is 454065031.

It is an interprime number because it is at equal distance from previous prime (1305604537) and next prime (1305604543).

It is a super-2 number, since 2×1305604540² = 3409206429737223200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1305604499 and 1305604508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1305604543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 693531 + ... + 695410.

It is an arithmetic number, because the mean of its divisors is an integer number (116671128).

Almost surely, 2^1305604540 is an apocalyptic number.

1305604540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1305604540 is an abundant number, since it is smaller than the sum of its proper divisors (1494502532).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1305604540 is a wasteful number, since it uses less digits than its factorization.

1305604540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1388997 (or 1388995 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 1305604540 is about 36133.1501532872. The cubic root of 1305604540 is about 1092.9590332940.

Adding to 1305604540 its reverse (454065031), we get a palindrome (1759669571).

The spelling of 1305604540 in words is "one billion, three hundred five million, six hundred four thousand, five hundred forty".