1381994 has 4 divisors (see below), whose sum is σ = 2072994. Its totient is φ = 690996.

The previous prime is 1381993. The next prime is 1381997. The reversal of 1381994 is 4991831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4991831 = 13 ⋅383987.

It can be written as a sum of positive squares in only one way, i.e., 1380625 + 1369 = 1175^2 + 37^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1381993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345497 + ... + 345500.

2^1381994 is an apocalyptic number.

1381994 is a deficient number, since it is larger than the sum of its proper divisors (691000).

1381994 is an equidigital number, since it uses as much as digits as its factorization.

1381994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 690999.

The product of its digits is 7776, while the sum is 35.

The square root of 1381994 is about 1175.5824088510. The cubic root of 1381994 is about 111.3872253540.

The spelling of 1381994 in words is "one million, three hundred eighty-one thousand, nine hundred ninety-four".