1290287 has 2 divisors, whose sum is σ = 1290288. Its totient is φ = 1290286.

The previous prime is 1290259. The next prime is 1290293. The reversal of 1290287 is 7820921.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1290287 - 2⁸ = 1290031 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1290257) 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, 645143 + 645144.

It is an arithmetic number, because the mean of its divisors is an integer number (645144).

2^1290287 is an apocalyptic number.

1290287 is a deficient number, since it is larger than the sum of its proper divisors (1).

1290287 is an equidigital number, since it uses as much as digits as its factorization.

1290287 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 1290287 is about 1135.9080068386. The cubic root of 1290287 is about 108.8667957321.

It can be divided in two parts, 1290 and 287, that multiplied together give a triangular number (370230 = T₈₆₀).

The spelling of 1290287 in words is "one million, two hundred ninety thousand, two hundred eighty-seven".