1286427 has 4 divisors (see below), whose sum is σ = 1715240. Its totient is φ = 857616.

The previous prime is 1286419. The next prime is 1286447. The reversal of 1286427 is 7246821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7246821 = 3 ⋅2415607.

It is not a de Polignac number, because 1286427 - 2³ = 1286419 is a prime.

It is a D-number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1286394 and 1286403.

It is not an unprimeable number, because it can be changed into a prime (1286447) 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, 214402 + ... + 214407.

It is an arithmetic number, because the mean of its divisors is an integer number (428810).

2^1286427 is an apocalyptic number.

1286427 is a deficient number, since it is larger than the sum of its proper divisors (428813).

1286427 is an equidigital number, since it uses as much as digits as its factorization.

1286427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428812.

The product of its digits is 5376, while the sum is 30.

The square root of 1286427 is about 1134.2076529454. The cubic root of 1286427 is about 108.7581259617.

It can be divided in two parts, 128 and 6427, that added together give a triangular number (6555 = T₁₁₄).

The spelling of 1286427 in words is "one million, two hundred eighty-six thousand, four hundred twenty-seven".