1281438 has 12 divisors (see below), whose sum is σ = 2776488. Its totient is φ = 427140.

The previous prime is 1281433. The next prime is 1281439. The reversal of 1281438 is 8341821.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1281431) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35578 + ... + 35613.

It is an arithmetic number, because the mean of its divisors is an integer number (231374).

2^1281438 is an apocalyptic number.

1281438 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1281438 is an abundant number, since it is smaller than the sum of its proper divisors (1495050).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1281438 is a wasteful number, since it uses less digits than its factorization.

1281438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71199 (or 71196 counting only the distinct ones).

The product of its digits is 1536, while the sum is 27.

The square root of 1281438 is about 1132.0061837287. The cubic root of 1281438 is about 108.6173491610.

The spelling of 1281438 in words is "one million, two hundred eighty-one thousand, four hundred thirty-eight".