1309666 has 16 divisors (see below), whose sum is σ = 2083968. Its totient is φ = 616000.

The previous prime is 1309661. The next prime is 1309673. The reversal of 1309666 is 6669031.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1309661) 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, 3066 + ... + 3466.

It is an arithmetic number, because the mean of its divisors is an integer number (130248).

2^1309666 is an apocalyptic number.

1309666 is a deficient number, since it is larger than the sum of its proper divisors (774302).

1309666 is a wasteful number, since it uses less digits than its factorization.

1309666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497.

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 1309666 is about 1144.4063963470. The cubic root of 1309666 is about 109.4091181725.

The spelling of 1309666 in words is "one million, three hundred nine thousand, six hundred sixty-six".