1290000655 has 32 divisors (see below), whose sum is σ = 1661233536. Its totient is φ = 959422464.

The previous prime is 1290000653. The next prime is 1290000659. The reversal of 1290000655 is 5560000921.

It is a cyclic number.

It is not a de Polignac number, because 1290000655 - 2¹ = 1290000653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1290000653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 687799 + ... + 689671.

It is an arithmetic number, because the mean of its divisors is an integer number (51913548).

Almost surely, 2^1290000655 is an apocalyptic number.

1290000655 is a deficient number, since it is larger than the sum of its proper divisors (371232881).

1290000655 is a wasteful number, since it uses less digits than its factorization.

1290000655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2067.

The product of its (nonzero) digits is 2700, while the sum is 28.

The square root of 1290000655 is about 35916.5791104888. The cubic root of 1290000655 is about 1088.5874176970.

The spelling of 1290000655 in words is "one billion, two hundred ninety million, six hundred fifty-five", and thus it is an aban number.