1289366426 has 8 divisors (see below), whose sum is σ = 1958531520. Its totient is φ = 636522588.

The previous prime is 1289366399. The next prime is 1289366443. The reversal of 1289366426 is 6246639821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4080116 + ... + 4080431.

It is an arithmetic number, because the mean of its divisors is an integer number (244816440).

Almost surely, 2^1289366426 is an apocalyptic number.

1289366426 is a deficient number, since it is larger than the sum of its proper divisors (669165094).

1289366426 is an equidigital number, since it uses as much as digits as its factorization.

1289366426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8160628.

The product of its digits is 746496, while the sum is 47.

The square root of 1289366426 is about 35907.7488294658. The cubic root of 1289366426 is about 1088.4089870673.

The spelling of 1289366426 in words is "one billion, two hundred eighty-nine million, three hundred sixty-six thousand, four hundred twenty-six".