1287246389 has 8 divisors (see below), whose sum is σ = 1512289632. Its totient is φ = 1080206640.

The previous prime is 1287246377. The next prime is 1287246397. The reversal of 1287246389 is 9836427821.

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

It is a cyclic number.

It is not a de Polignac number, because 1287246389 - 2⁸ = 1287246133 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1287246349) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4500719 + ... + 4501004.

It is an arithmetic number, because the mean of its divisors is an integer number (189036204).

Almost surely, 2^1287246389 is an apocalyptic number.

It is an amenable number.

1287246389 is a deficient number, since it is larger than the sum of its proper divisors (225043243).

1287246389 is a wasteful number, since it uses less digits than its factorization.

1287246389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9001747.

The product of its digits is 1161216, while the sum is 50.

The square root of 1287246389 is about 35878.2160788409. The cubic root of 1287246389 is about 1087.8121220448.

The spelling of 1287246389 in words is "one billion, two hundred eighty-seven million, two hundred forty-six thousand, three hundred eighty-nine".