1305945 has 12 divisors (see below), whose sum is σ = 2263716. Its totient is φ = 696480.

The previous prime is 1305919. The next prime is 1305947. The reversal of 1305945 is 5495031.

It can be written as a sum of positive squares in 2 ways, for example, as 974169 + 331776 = 987^2 + 576^2 .

It is not a de Polignac number, because 1305945 - 2⁶ = 1305881 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1305947) 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 in 11 ways as a sum of consecutive naturals, for example, 14466 + ... + 14555.

It is an arithmetic number, because the mean of its divisors is an integer number (188643).

2^1305945 is an apocalyptic number.

1305945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1305945 is a deficient number, since it is larger than the sum of its proper divisors (957771).

1305945 is a wasteful number, since it uses less digits than its factorization.

1305945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29032 (or 29029 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 27.

The square root of 1305945 is about 1142.7795062916. The cubic root of 1305945 is about 109.3054027983.

The spelling of 1305945 in words is "one million, three hundred five thousand, nine hundred forty-five".