1306523 has 4 divisors (see below), whose sum is σ = 1308888. Its totient is φ = 1304160.

The previous prime is 1306519. The next prime is 1306541. The reversal of 1306523 is 3256031.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1306523 - 2² = 1306519 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1306495 and 1306504.

It is not an unprimeable number, because it can be changed into a prime (1306223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140 + ... + 1622.

It is an arithmetic number, because the mean of its divisors is an integer number (327222).

2^1306523 is an apocalyptic number.

1306523 is a deficient number, since it is larger than the sum of its proper divisors (2365).

1306523 is an equidigital number, since it uses as much as digits as its factorization.

1306523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2364.

The product of its (nonzero) digits is 540, while the sum is 20.

The square root of 1306523 is about 1143.0323704953. The cubic root of 1306523 is about 109.3215262962.

The spelling of 1306523 in words is "one million, three hundred six thousand, five hundred twenty-three".