1290878289 has 40 divisors (see below), whose sum is σ = 2130606720. Its totient is φ = 774728064.

The previous prime is 1290878263. The next prime is 1290878293. The reversal of 1290878289 is 9828780921.

1290878289 is a `hidden beast` number, since 1 + 290 + 8 + 78 + 289 = 666.

It is not a de Polignac number, because 1290878289 - 2⁵ = 1290878257 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1290878489) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 11292 + ... + 52050.

It is an arithmetic number, because the mean of its divisors is an integer number (53265168).

Almost surely, 2^1290878289 is an apocalyptic number.

It is an amenable number.

1290878289 is a deficient number, since it is larger than the sum of its proper divisors (839728431).

1290878289 is a wasteful number, since it uses less digits than its factorization.

1290878289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40811 (or 40802 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 54.

The square root of 1290878289 is about 35928.7947056397. The cubic root of 1290878289 is about 1088.8342301690.

The spelling of 1290878289 in words is "one billion, two hundred ninety million, eight hundred seventy-eight thousand, two hundred eighty-nine".