1290605 has 8 divisors (see below), whose sum is σ = 1555200. Its totient is φ = 1028176.

The previous prime is 1290593. The next prime is 1290607. The reversal of 1290605 is 5060921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-1290605 is a prime.

It is a super-2 number, since 2×1290605² = 3331322532050, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1290607) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1436 + ... + 2154.

It is an arithmetic number, because the mean of its divisors is an integer number (194400).

2^1290605 is an apocalyptic number.

It is an amenable number.

1290605 is a deficient number, since it is larger than the sum of its proper divisors (264595).

1290605 is an equidigital number, since it uses as much as digits as its factorization.

1290605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1083.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 1290605 is about 1136.0479743391. The cubic root of 1290605 is about 108.8757386513.

The spelling of 1290605 in words is "one million, two hundred ninety thousand, six hundred five".