1309606 has 4 divisors (see below), whose sum is σ = 1964412. Its totient is φ = 654802.

The previous prime is 1309601. The next prime is 1309631. The reversal of 1309606 is 6069031.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6069031 = 1427 ⋅4253.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1309601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327400 + ... + 327403.

It is an arithmetic number, because the mean of its divisors is an integer number (491103).

2^1309606 is an apocalyptic number.

1309606 is a deficient number, since it is larger than the sum of its proper divisors (654806).

1309606 is an equidigital number, since it uses as much as digits as its factorization.

1309606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 654805.

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 1309606 is about 1144.3801815830. The cubic root of 1309606 is about 109.4074473528.

The spelling of 1309606 in words is "one million, three hundred nine thousand, six hundred six".