1305642 has 32 divisors (see below), whose sum is σ = 2963520. Its totient is φ = 380160.

The previous prime is 1305637. The next prime is 1305643. The reversal of 1305642 is 2465031.

It is a happy number.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (1305643) 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 15 ways as a sum of consecutive naturals, for example, 1042 + ... + 1922.

It is an arithmetic number, because the mean of its divisors is an integer number (92610).

2^1305642 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1305642, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1481760).

1305642 is an abundant number, since it is smaller than the sum of its proper divisors (1657878).

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

1305642 is a wasteful number, since it uses less digits than its factorization.

1305642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 918.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 1305642 is about 1142.6469270952. The cubic root of 1305642 is about 109.2969486141.

The spelling of 1305642 in words is "one million, three hundred five thousand, six hundred forty-two".