1290217 has 4 divisors (see below), whose sum is σ = 1292500. Its totient is φ = 1287936.

The previous prime is 1290209. The next prime is 1290257. The reversal of 1290217 is 7120921.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 958441 + 331776 = 979^2 + 576^2 .

It is a cyclic number.

It is not a de Polignac number, because 1290217 - 2³ = 1290209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1290257) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 409 + ... + 1657.

It is an arithmetic number, because the mean of its divisors is an integer number (323125).

2^1290217 is an apocalyptic number.

It is an amenable number.

1290217 is a deficient number, since it is larger than the sum of its proper divisors (2283).

1290217 is a wasteful number, since it uses less digits than its factorization.

1290217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2282.

The product of its (nonzero) digits is 252, while the sum is 22.

The square root of 1290217 is about 1135.8771940663. The cubic root of 1290217 is about 108.8648269677.

The spelling of 1290217 in words is "one million, two hundred ninety thousand, two hundred seventeen".