1292287 has 4 divisors (see below), whose sum is σ = 1294920. Its totient is φ = 1289656.

The previous prime is 1292281. The next prime is 1292293. The reversal of 1292287 is 7822921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7822921 = 23 ⋅340127.

It is an interprime number because it is at equal distance from previous prime (1292281) and next prime (1292293).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1292287 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1292281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 337 + ... + 1642.

It is an arithmetic number, because the mean of its divisors is an integer number (323730).

2^1292287 is an apocalyptic number.

1292287 is a deficient number, since it is larger than the sum of its proper divisors (2633).

1292287 is an equidigital number, since it uses as much as digits as its factorization.

1292287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2632.

The product of its digits is 4032, while the sum is 31.

The square root of 1292287 is about 1136.7880189376. The cubic root of 1292287 is about 108.9230160897.

The spelling of 1292287 in words is "one million, two hundred ninety-two thousand, two hundred eighty-seven".