13942666 has 4 divisors (see below), whose sum is σ = 20914002. Its totient is φ = 6971332.

The previous prime is 13942661. The next prime is 13942667. The reversal of 13942666 is 66624931.

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: 66624931 = 43 ⋅1549417.

It can be written as a sum of positive squares in only one way, i.e., 8555625 + 5387041 = 2925^2 + 2321^2 .

It is not an unprimeable number, because it can be changed into a prime (13942661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3485665 + ... + 3485668.

Almost surely, 2^13942666 is an apocalyptic number.

13942666 is a deficient number, since it is larger than the sum of its proper divisors (6971336).

13942666 is an equidigital number, since it uses as much as digits as its factorization.

13942666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6971335.

The product of its digits is 46656, while the sum is 37.

The square root of 13942666 is about 3733.9879485612. The cubic root of 13942666 is about 240.6847688937.

The spelling of 13942666 in words is "thirteen million, nine hundred forty-two thousand, six hundred sixty-six".