1290609 has 6 divisors (see below), whose sum is σ = 1864226. Its totient is φ = 860400.

The previous prime is 1290607. The next prime is 1290629. The reversal of 1290609 is 9060921.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1272384 + 18225 = 1128^2 + 135^2 .

It is not a de Polignac number, because 1290609 - 2¹ = 1290607 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1290607) 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 in 5 ways as a sum of consecutive naturals, for example, 71692 + ... + 71709.

2^1290609 is an apocalyptic number.

It is an amenable number.

1290609 is a deficient number, since it is larger than the sum of its proper divisors (573617).

1290609 is a wasteful number, since it uses less digits than its factorization.

1290609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143407 (or 143404 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 1290609 is about 1136.0497348268. The cubic root of 1290609 is about 108.8758511315.

The spelling of 1290609 in words is "one million, two hundred ninety thousand, six hundred nine".