1289867397 has 64 divisors (see below), whose sum is σ = 2186494464. Its totient is φ = 658160640.

The previous prime is 1289867357. The next prime is 1289867407. The reversal of 1289867397 is 7937689821.

It is not a de Polignac number, because 1289867397 - 2⁸ = 1289867141 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1289867397.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1289867357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2797747 + ... + 2798207.

It is an arithmetic number, because the mean of its divisors is an integer number (34163976).

Almost surely, 2^1289867397 is an apocalyptic number.

It is an amenable number.

1289867397 is a deficient number, since it is larger than the sum of its proper divisors (896627067).

1289867397 is a wasteful number, since it uses less digits than its factorization.

1289867397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 798.

The product of its digits is 9144576, while the sum is 60.

The square root of 1289867397 is about 35914.7239582876. The cubic root of 1289867397 is about 1088.5499324505.

The spelling of 1289867397 in words is "one billion, two hundred eighty-nine million, eight hundred sixty-seven thousand, three hundred ninety-seven".