1340666 has 4 divisors (see below), whose sum is σ = 2011002. Its totient is φ = 670332.

The previous prime is 1340653. The next prime is 1340681. The reversal of 1340666 is 6660431.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6660431 = 19 ⋅350549.

It can be written as a sum of positive squares in only one way, i.e., 1288225 + 52441 = 1135^2 + 229^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335165 + ... + 335168.

2^1340666 is an apocalyptic number.

1340666 is a deficient number, since it is larger than the sum of its proper divisors (670336).

1340666 is an equidigital number, since it uses as much as digits as its factorization.

1340666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670335.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 1340666 is about 1157.8713227298. The cubic root of 1340666 is about 110.2656389838.

The spelling of 1340666 in words is "one million, three hundred forty thousand, six hundred sixty-six".