1305390 has 32 divisors (see below), whose sum is σ = 3195936. Its totient is φ = 341120.

The previous prime is 1305383. The next prime is 1305391. The reversal of 1305390 is 935031.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1305391) 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 15 ways as a sum of consecutive naturals, for example, 1180 + ... + 2000.

It is an arithmetic number, because the mean of its divisors is an integer number (99873).

2^1305390 is an apocalyptic number.

1305390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1305390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1597968).

1305390 is an abundant number, since it is smaller than the sum of its proper divisors (1890546).

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

1305390 is a wasteful number, since it uses less digits than its factorization.

1305390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 884.

The product of its (nonzero) digits is 405, while the sum is 21.

The square root of 1305390 is about 1142.5366514909. The cubic root of 1305390 is about 109.2899164151.

The spelling of 1305390 in words is "one million, three hundred five thousand, three hundred ninety".