1290638 has 16 divisors (see below), whose sum is σ = 2008800. Its totient is φ = 621600.

The previous prime is 1290637. The next prime is 1290643. The reversal of 1290638 is 8360921.

It is a self number, because there is not a number n which added to its sum of digits gives 1290638.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a 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 in 7 ways as a sum of consecutive naturals, for example, 8588 + ... + 8736.

It is an arithmetic number, because the mean of its divisors is an integer number (125550).

2^1290638 is an apocalyptic number.

1290638 is a deficient number, since it is larger than the sum of its proper divisors (718162).

1290638 is a wasteful number, since it uses less digits than its factorization.

1290638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 1290638 is about 1136.0624982808. The cubic root of 1290638 is about 108.8766666060.

The spelling of 1290638 in words is "one million, two hundred ninety thousand, six hundred thirty-eight".