1281946 has 4 divisors (see below), whose sum is σ = 1922922. Its totient is φ = 640972.

The previous prime is 1281941. The next prime is 1281961. The reversal of 1281946 is 6491821.

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: 6491821 = 7 ⋅927403.

It can be written as a sum of positive squares in only one way, i.e., 1113025 + 168921 = 1055^2 + 411^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (1281941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320485 + ... + 320488.

2^1281946 is an apocalyptic number.

1281946 is a deficient number, since it is larger than the sum of its proper divisors (640976).

1281946 is an equidigital number, since it uses as much as digits as its factorization.

1281946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 640975.

The product of its digits is 3456, while the sum is 31.

The square root of 1281946 is about 1132.2305418951. The cubic root of 1281946 is about 108.6317003101.

The spelling of 1281946 in words is "one million, two hundred eighty-one thousand, nine hundred forty-six".