1286421 has 4 divisors (see below), whose sum is σ = 1715232. Its totient is φ = 857612.

The previous prime is 1286419. The next prime is 1286447. The reversal of 1286421 is 1246821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1246821 = 3 ⋅415607.

It is a cyclic number.

It is not a de Polignac number, because 1286421 - 2¹ = 1286419 is a prime.

It is a D-number.

It is a junction number, because it is equal to n+sod(n) for n = 1286391 and 1286400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1286491) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 214401 + ... + 214406.

It is an arithmetic number, because the mean of its divisors is an integer number (428808).

2^1286421 is an apocalyptic number.

It is an amenable number.

1286421 is a deficient number, since it is larger than the sum of its proper divisors (428811).

1286421 is an equidigital number, since it uses as much as digits as its factorization.

1286421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428810.

The product of its digits is 768, while the sum is 24.

The square root of 1286421 is about 1134.2050079241. The cubic root of 1286421 is about 108.7579568759.

The spelling of 1286421 in words is "one million, two hundred eighty-six thousand, four hundred twenty-one".