1286381 has 2 divisors, whose sum is σ = 1286382. Its totient is φ = 1286380.

The previous prime is 1286371. The next prime is 1286387. The reversal of 1286381 is 1836821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1190281 + 96100 = 1091^2 + 310^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1286381 is a prime.

It is a super-3 number, since 3×1286381³ = 6386017514743333023, which contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1286387) 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 as a sum of consecutive naturals, namely, 643190 + 643191.

It is an arithmetic number, because the mean of its divisors is an integer number (643191).

2^1286381 is an apocalyptic number.

It is an amenable number.

1286381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1286381 is an equidigital number, since it uses as much as digits as its factorization.

1286381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2304, while the sum is 29.

The square root of 1286381 is about 1134.1873742905. The cubic root of 1286381 is about 108.7568296235.

The spelling of 1286381 in words is "one million, two hundred eighty-six thousand, three hundred eighty-one".