1290905 has 24 divisors (see below), whose sum is σ = 1969920. Its totient is φ = 803040.

The previous prime is 1290901. The next prime is 1290907. The reversal of 1290905 is 5090921.

It is a happy number.

It is not a de Polignac number, because 1290905 - 2² = 1290901 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (1290901) 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 23 ways as a sum of consecutive naturals, for example, 2456 + ... + 2934.

It is an arithmetic number, because the mean of its divisors is an integer number (82080).

2^1290905 is an apocalyptic number.

It is an amenable number.

1290905 is a deficient number, since it is larger than the sum of its proper divisors (679015).

1290905 is a wasteful number, since it uses less digits than its factorization.

1290905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 509 (or 502 counting only the distinct ones).

The product of its (nonzero) digits is 810, while the sum is 26.

The square root of 1290905 is about 1136.1800033445. The cubic root of 1290905 is about 108.8841740211.

The spelling of 1290905 in words is "one million, two hundred ninety thousand, nine hundred five".