1305238185 has 16 divisors (see below), whose sum is σ = 2320423680. Its totient is φ = 696126960.

The previous prime is 1305238171. The next prime is 1305238243. The reversal of 1305238185 is 5818325031.

It is not a de Polignac number, because 1305238185 - 2⁴ = 1305238169 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4834081 + ... + 4834350.

It is an arithmetic number, because the mean of its divisors is an integer number (145026480).

Almost surely, 2^1305238185 is an apocalyptic number.

1305238185 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1305238185 is a deficient number, since it is larger than the sum of its proper divisors (1015185495).

1305238185 is an equidigital number, since it uses as much as digits as its factorization.

1305238185 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9668445 (or 9668439 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

The square root of 1305238185 is about 36128.0802839011. The cubic root of 1305238185 is about 1092.8567949689.

The spelling of 1305238185 in words is "one billion, three hundred five million, two hundred thirty-eight thousand, one hundred eighty-five".