1381330305 has 24 divisors (see below), whose sum is σ = 2520323520. Its totient is φ = 697934880.

The previous prime is 1381330217. The next prime is 1381330331. The reversal of 1381330305 is 5030331831.

It is not a de Polignac number, because 1381330305 - 2⁹ = 1381329793 is a prime.

It is a super-2 number, since 2×1381330305² = 3816146823022786050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 806941 + ... + 808650.

It is an arithmetic number, because the mean of its divisors is an integer number (105013480).

Almost surely, 2^1381330305 is an apocalyptic number.

1381330305 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1381330305 is a deficient number, since it is larger than the sum of its proper divisors (1138993215).

1381330305 is a wasteful number, since it uses less digits than its factorization.

1381330305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1615621 (or 1615618 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 1381330305 is about 37166.2522323680. The cubic root of 1381330305 is about 1113.6939146520.

The spelling of 1381330305 in words is "one billion, three hundred eighty-one million, three hundred thirty thousand, three hundred five".