1287273384 has 80 divisors (see below), whose sum is σ = 3762364320. Its totient is φ = 410430240.

The previous prime is 1287273367. The next prime is 1287273391. The reversal of 1287273384 is 4833727821.

It is a super-2 number, since 2×1287273384² = 3314145530309622912, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 28282 + ... + 58089.

It is an arithmetic number, because the mean of its divisors is an integer number (47029554).

Almost surely, 2^1287273384 is an apocalyptic number.

It is an amenable number.

1287273384 is an abundant number, since it is smaller than the sum of its proper divisors (2475090936).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1287273384 is a wasteful number, since it uses less digits than its factorization.

1287273384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86412 (or 86399 counting only the distinct ones).

The product of its digits is 451584, while the sum is 45.

The square root of 1287273384 is about 35878.5922800770. The cubic root of 1287273384 is about 1087.8197262050.

The spelling of 1287273384 in words is "one billion, two hundred eighty-seven million, two hundred seventy-three thousand, three hundred eighty-four".