1306640523 has 8 divisors (see below), whose sum is σ = 1742741136. Its totient is φ = 870816800.

The previous prime is 1306640509. The next prime is 1306640549. The reversal of 1306640523 is 3250466031.

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

It is a cyclic number.

It is not a de Polignac number, because 1306640523 - 2¹² = 1306636427 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1306640123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57948 + ... + 77273.

It is an arithmetic number, because the mean of its divisors is an integer number (217842642).

Almost surely, 2^1306640523 is an apocalyptic number.

1306640523 is a deficient number, since it is larger than the sum of its proper divisors (436100613).

1306640523 is a wasteful number, since it uses less digits than its factorization.

1306640523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138445.

The product of its (nonzero) digits is 12960, while the sum is 30.

The square root of 1306640523 is about 36147.4829414165. The cubic root of 1306640523 is about 1093.2480405673.

The spelling of 1306640523 in words is "one billion, three hundred six million, six hundred forty thousand, five hundred twenty-three".