1305997 has 12 divisors (see below), whose sum is σ = 1658016. Its totient is φ = 1017240.

The previous prime is 1305971. The next prime is 1306001. The reversal of 1305997 is 7995031.

It is not a de Polignac number, because 1305997 - 2⁷ = 1305869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1305907) 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, 673 + ... + 1750.

It is an arithmetic number, because the mean of its divisors is an integer number (138168).

2^1305997 is an apocalyptic number.

It is an amenable number.

1305997 is a deficient number, since it is larger than the sum of its proper divisors (352019).

1305997 is a wasteful number, since it uses less digits than its factorization.

1305997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2448 (or 2441 counting only the distinct ones).

The product of its (nonzero) digits is 8505, while the sum is 34.

The square root of 1305997 is about 1142.8022576107. The cubic root of 1305997 is about 109.3068535500.

Adding to 1305997 its sum of digits (34), we get a palindrome (1306031).

The spelling of 1305997 in words is "one million, three hundred five thousand, nine hundred ninety-seven".