1287542789 has 16 divisors (see below), whose sum is σ = 1403720640. Its totient is φ = 1173864960.

The previous prime is 1287542759. The next prime is 1287542831. The reversal of 1287542789 is 9872457821.

It is a cyclic number.

It is not a de Polignac number, because 1287542789 - 2²⁸ = 1019107333 is a prime.

It is a super-3 number, since 3×1287542789³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1287542789.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1287542759) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1022042 + ... + 1023300.

It is an arithmetic number, because the mean of its divisors is an integer number (87732540).

Almost surely, 2^1287542789 is an apocalyptic number.

It is an amenable number.

1287542789 is a deficient number, since it is larger than the sum of its proper divisors (116177851).

1287542789 is a wasteful number, since it uses less digits than its factorization.

1287542789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2180.

The product of its digits is 2257920, while the sum is 53.

The square root of 1287542789 is about 35882.3464812434. The cubic root of 1287542789 is about 1087.8956084625.

The spelling of 1287542789 in words is "one billion, two hundred eighty-seven million, five hundred forty-two thousand, seven hundred eighty-nine".