1290869 has 2 divisors, whose sum is σ = 1290870. Its totient is φ = 1290868.

The previous prime is 1290857. The next prime is 1290901. The reversal of 1290869 is 9680921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 786769 + 504100 = 887^2 + 710^2 .

It is a cyclic number.

It is not a de Polignac number, because 1290869 - 2⁴ = 1290853 is a prime.

It is a super-2 number, since 2×1290869² = 3332685550322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1290169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645434 + 645435.

It is an arithmetic number, because the mean of its divisors is an integer number (645435).

2^1290869 is an apocalyptic number.

It is an amenable number.

1290869 is a deficient number, since it is larger than the sum of its proper divisors (1).

1290869 is an equidigital number, since it uses as much as digits as its factorization.

1290869 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 1290869 is about 1136.1641606740. The cubic root of 1290869 is about 108.8831618457.

The spelling of 1290869 in words is "one million, two hundred ninety thousand, eight hundred sixty-nine".