1289431296 has 54 divisors (see below), whose sum is σ = 3717754950. Its totient is φ = 429809664.

The previous prime is 1289431271. The next prime is 1289431307. The reversal of 1289431296 is 6921349821.

1289431296 is a `hidden beast` number, since 128 + 9 + 431 + 2 + 96 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1278777600 + 10653696 = 35760^2 + 3264^2 .

It is a super-3 number, since 3×1289431296³ (a number of 28 digits) contains 333 as substring.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 277521 + ... + 282128.

Almost surely, 2^1289431296 is an apocalyptic number.

1289431296 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1289431296 is an abundant number, since it is smaller than the sum of its proper divisors (2428323654).

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

1289431296 is an equidigital number, since it uses as much as digits as its factorization.

1289431296 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 559671 (or 559654 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 1289431296 is about 35908.6521050289. The cubic root of 1289431296 is about 1088.4272399357.

The spelling of 1289431296 in words is "one billion, two hundred eighty-nine million, four hundred thirty-one thousand, two hundred ninety-six".