1287472869 has 12 divisors (see below), whose sum is σ = 1860121900. Its totient is φ = 858112704.

The previous prime is 1287472861. The next prime is 1287472931. The reversal of 1287472869 is 9682747821.

It is a happy number.

1287472869 is a `hidden beast` number, since 12 + 87 + 472 + 86 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 714492900 + 572979969 = 26730^2 + 23937^2 .

It is not a de Polignac number, because 1287472869 - 2³ = 1287472861 is a prime.

It is a super-2 number, since 2×1287472869² = 3315172776822182322, which contains 22 as substring.

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 (1287472861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30327 + ... + 59115.

Almost surely, 2^1287472869 is an apocalyptic number.

It is an amenable number.

1287472869 is a deficient number, since it is larger than the sum of its proper divisors (572649031).

1287472869 is a wasteful number, since it uses less digits than its factorization.

1287472869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33764 (or 33761 counting only the distinct ones).

The product of its digits is 2709504, while the sum is 54.

The square root of 1287472869 is about 35881.3721727584. The cubic root of 1287472869 is about 1087.8759153855.

The spelling of 1287472869 in words is "one billion, two hundred eighty-seven million, four hundred seventy-two thousand, eight hundred sixty-nine".