1306643 has 4 divisors (see below), whose sum is σ = 1407168. Its totient is φ = 1206120.

The previous prime is 1306633. The next prime is 1306661. The reversal of 1306643 is 3466031.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3466031 = 23 ⋅150697.

It is a cyclic number.

It is not a de Polignac number, because 1306643 - 2⁸ = 1306387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1306633) 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, 50243 + ... + 50268.

It is an arithmetic number, because the mean of its divisors is an integer number (351792).

2^1306643 is an apocalyptic number.

1306643 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1306643 is a deficient number, since it is larger than the sum of its proper divisors (100525).

1306643 is a wasteful number, since it uses less digits than its factorization.

1306643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100524.

The product of its (nonzero) digits is 1296, while the sum is 23.

The square root of 1306643 is about 1143.0848612417. The cubic root of 1306643 is about 109.3248731391.

The spelling of 1306643 in words is "one million, three hundred six thousand, six hundred forty-three".