1381966 has 8 divisors (see below), whose sum is σ = 2144520. Its totient is φ = 667128.

The previous prime is 1381921. The next prime is 1381967. The reversal of 1381966 is 6691831.

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

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1381967) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11856 + ... + 11971.

It is an arithmetic number, because the mean of its divisors is an integer number (268065).

2^1381966 is an apocalyptic number.

1381966 is a deficient number, since it is larger than the sum of its proper divisors (762554).

1381966 is a wasteful number, since it uses less digits than its factorization.

1381966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23858.

The product of its digits is 7776, while the sum is 34.

The square root of 1381966 is about 1175.5704998000. The cubic root of 1381966 is about 111.3864730924.

The spelling of 1381966 in words is "one million, three hundred eighty-one thousand, nine hundred sixty-six".