1309493 has 4 divisors (see below), whose sum is σ = 1386540. Its totient is φ = 1232448.

The previous prime is 1309463. The next prime is 1309501. The reversal of 1309493 is 3949031.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3949031 = 23 ⋅171697.

It can be written as a sum of positive squares in 2 ways, for example, as 1085764 + 223729 = 1042^2 + 473^2 .

It is a cyclic number.

It is not a de Polignac number, because 1309493 - 2⁸ = 1309237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1309463) 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, 38498 + ... + 38531.

It is an arithmetic number, because the mean of its divisors is an integer number (346635).

2^1309493 is an apocalyptic number.

It is an amenable number.

1309493 is a deficient number, since it is larger than the sum of its proper divisors (77047).

1309493 is an equidigital number, since it uses as much as digits as its factorization.

1309493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77046.

The product of its (nonzero) digits is 2916, while the sum is 29.

The square root of 1309493 is about 1144.3308088136. The cubic root of 1309493 is about 109.4043005037.

The spelling of 1309493 in words is "one million, three hundred nine thousand, four hundred ninety-three".