1366646 has 4 divisors (see below), whose sum is σ = 2049972. Its totient is φ = 683322.

The previous prime is 1366643. The next prime is 1366649. The reversal of 1366646 is 6466631.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1366643) and next prime (1366649).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1366643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 341660 + ... + 341663.

It is an arithmetic number, because the mean of its divisors is an integer number (512493).

2^1366646 is an apocalyptic number.

1366646 is a deficient number, since it is larger than the sum of its proper divisors (683326).

1366646 is an equidigital number, since it uses as much as digits as its factorization.

1366646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 683325.

The product of its digits is 15552, while the sum is 32.

The square root of 1366646 is about 1169.0363552944. The cubic root of 1366646 is about 110.9733453300.

The spelling of 1366646 in words is "one million, three hundred sixty-six thousand, six hundred forty-six".