1287382240 has 48 divisors (see below), whose sum is σ = 3201523920. Its totient is φ = 487848960.

The previous prime is 1287382199. The next prime is 1287382249. The reversal of 1287382240 is 422837821.

It is a self number, because there is not a number n which added to its sum of digits gives 1287382240.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1287382249) 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, 208701 + ... + 214780.

It is an arithmetic number, because the mean of its divisors is an integer number (66698415).

Almost surely, 2^1287382240 is an apocalyptic number.

1287382240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1287382240 is an abundant number, since it is smaller than the sum of its proper divisors (1914141680).

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

1287382240 is a wasteful number, since it uses less digits than its factorization.

1287382240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423515 (or 423507 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 37.

The square root of 1287382240 is about 35880.1092528994. The cubic root of 1287382240 is about 1087.8503885252.

The spelling of 1287382240 in words is "one billion, two hundred eighty-seven million, three hundred eighty-two thousand, two hundred forty".