1287394332 has 48 divisors (see below), whose sum is σ = 3551439360. Its totient is φ = 355142592.

The previous prime is 1287394331. The next prime is 1287394351. The reversal of 1287394332 is 2334937821.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1287394331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 261808 + ... + 266679.

It is an arithmetic number, because the mean of its divisors is an integer number (73988320).

Almost surely, 2^1287394332 is an apocalyptic number.

1287394332 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1287394332 is an abundant number, since it is smaller than the sum of its proper divisors (2264045028).

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

1287394332 is a wasteful number, since it uses less digits than its factorization.

1287394332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 528530 (or 528528 counting only the distinct ones).

The product of its digits is 217728, while the sum is 42.

The square root of 1287394332 is about 35880.2777581222. The cubic root of 1287394332 is about 1087.8537944667.

The spelling of 1287394332 in words is "one billion, two hundred eighty-seven million, three hundred ninety-four thousand, three hundred thirty-two".