1305890 has 8 divisors (see below), whose sum is σ = 2350620. Its totient is φ = 522352.

The previous prime is 1305881. The next prime is 1305893. The reversal of 1305890 is 985031.

It can be written as a sum of positive squares in 2 ways, for example, as 1283689 + 22201 = 1133^2 + 149^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1305893) 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 3 ways as a sum of consecutive naturals, for example, 65285 + ... + 65304.

2^1305890 is an apocalyptic number.

1305890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1305890 is a deficient number, since it is larger than the sum of its proper divisors (1044730).

1305890 is a wasteful number, since it uses less digits than its factorization.

1305890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130596.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 1305890 is about 1142.7554419035. The cubic root of 1305890 is about 109.3038683076.

The spelling of 1305890 in words is "one million, three hundred five thousand, eight hundred ninety".