1281421 has 8 divisors (see below), whose sum is σ = 1340640. Its totient is φ = 1223568.

The previous prime is 1281407. The next prime is 1281431. The reversal of 1281421 is 1241821.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1281421 - 2⁵ = 1281389 is a prime.

It is a Duffinian number.

1281421 is a lucky number.

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 pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1890 + ... + 2476.

It is an arithmetic number, because the mean of its divisors is an integer number (167580).

2^1281421 is an apocalyptic number.

It is an amenable number.

1281421 is a deficient number, since it is larger than the sum of its proper divisors (59219).

1281421 is an equidigital number, since it uses as much as digits as its factorization.

1281421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 683.

The product of its digits is 128, while the sum is 19.

The square root of 1281421 is about 1131.9986749109. The cubic root of 1281421 is about 108.6168688404.

The spelling of 1281421 in words is "one million, two hundred eighty-one thousand, four hundred twenty-one".