1305738 has 48 divisors (see below), whose sum is σ = 3322176. Its totient is φ = 362880.

The previous prime is 1305713. The next prime is 1305739. The reversal of 1305738 is 8375031.

It is not an unprimeable number, because it can be changed into a prime (1305739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5298 + ... + 5538.

It is an arithmetic number, because the mean of its divisors is an integer number (69212).

2^1305738 is an apocalyptic number.

1305738 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1305738 is the 723-rd heptagonal number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1305738, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1661088).

1305738 is an abundant number, since it is smaller than the sum of its proper divisors (2016438).

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

1305738 is a wasteful number, since it uses less digits than its factorization.

1305738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299 (or 296 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 1305738 is about 1142.6889340499. The cubic root of 1305738 is about 109.2996273091.

The spelling of 1305738 in words is "one million, three hundred five thousand, seven hundred thirty-eight".