1376666 has 4 divisors (see below), whose sum is σ = 2065002. Its totient is φ = 688332.

The previous prime is 1376653. The next prime is 1376693. The reversal of 1376666 is 6666731.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6666731 = 79 ⋅84389.

It can be written as a sum of positive squares in only one way, i.e., 1050625 + 326041 = 1025^2 + 571^2 .

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344165 + ... + 344168.

2^1376666 is an apocalyptic number.

1376666 is a deficient number, since it is larger than the sum of its proper divisors (688336).

1376666 is an equidigital number, since it uses as much as digits as its factorization.

1376666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 688335.

The product of its digits is 27216, while the sum is 35.

The square root of 1376666 is about 1173.3141096910. The cubic root of 1376666 is about 111.2438973213.

The spelling of 1376666 in words is "one million, three hundred seventy-six thousand, six hundred sixty-six".