1290637 has 2 divisors, whose sum is σ = 1290638. Its totient is φ = 1290636.

The previous prime is 1290631. The next prime is 1290643. The reversal of 1290637 is 7360921.

It is a balanced prime because it is at equal distance from previous prime (1290631) and next prime (1290643).

It can be written as a sum of positive squares in only one way, i.e., 799236 + 491401 = 894^2 + 701^2 .

It is an emirp because it is prime and its reverse (7360921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1290637 - 2³ = 1290629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1290631) 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, 645318 + 645319.

It is an arithmetic number, because the mean of its divisors is an integer number (645319).

2^1290637 is an apocalyptic number.

It is an amenable number.

1290637 is a deficient number, since it is larger than the sum of its proper divisors (1).

1290637 is an equidigital number, since it uses as much as digits as its factorization.

1290637 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2268, while the sum is 28.

The square root of 1290637 is about 1136.0620581641. The cubic root of 1290637 is about 108.8766384864.

The spelling of 1290637 in words is "one million, two hundred ninety thousand, six hundred thirty-seven".