1281838 has 4 divisors (see below), whose sum is σ = 1922760. Its totient is φ = 640918.

The previous prime is 1281827. The next prime is 1281853. The reversal of 1281838 is 8381821.

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

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 a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320458 + ... + 320461.

It is an arithmetic number, because the mean of its divisors is an integer number (480690).

2^1281838 is an apocalyptic number.

1281838 is a deficient number, since it is larger than the sum of its proper divisors (640922).

1281838 is an equidigital number, since it uses as much as digits as its factorization.

1281838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 640921.

The product of its digits is 3072, while the sum is 31.

The square root of 1281838 is about 1132.1828474235. The cubic root of 1281838 is about 108.6286495958.

The spelling of 1281838 in words is "one million, two hundred eighty-one thousand, eight hundred thirty-eight".