1289258928 has 60 divisors (see below), whose sum is σ = 3765019440. Its totient is φ = 411067008.

The previous prime is 1289258921. The next prime is 1289258933. The reversal of 1289258928 is 8298529821.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1289258921) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 191323 + ... + 197946.

It is an arithmetic number, because the mean of its divisors is an integer number (62750324).

Almost surely, 2^1289258928 is an apocalyptic number.

1289258928 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1289258928 is an abundant number, since it is smaller than the sum of its proper divisors (2475760512).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1289258928 is a wasteful number, since it uses less digits than its factorization.

1289258928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389306 (or 389297 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 54.

The square root of 1289258928 is about 35906.2519347258. The cubic root of 1289258928 is about 1088.3787383501.

The spelling of 1289258928 in words is "one billion, two hundred eighty-nine million, two hundred fifty-eight thousand, nine hundred twenty-eight".