1391966 has 8 divisors (see below), whose sum is σ = 2097984. Its totient is φ = 692640.

The previous prime is 1391941. The next prime is 1391969. The reversal of 1391966 is 6691931.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1391969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1115 + ... + 2006.

It is an arithmetic number, because the mean of its divisors is an integer number (262248).

2^1391966 is an apocalyptic number.

1391966 is a deficient number, since it is larger than the sum of its proper divisors (706018).

1391966 is a wasteful number, since it uses less digits than its factorization.

1391966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3346.

The product of its digits is 8748, while the sum is 35.

The square root of 1391966 is about 1179.8160873628. The cubic root of 1391966 is about 111.6544943540.

Subtracting from 1391966 its sum of digits (35), we obtain a palindrome (1391931).

The spelling of 1391966 in words is "one million, three hundred ninety-one thousand, nine hundred sixty-six".