1287452992 has 56 divisors (see below), whose sum is σ = 2923828544. Its totient is φ = 550996992.

The previous prime is 1287452989. The next prime is 1287453001. The reversal of 1287452992 is 2992547821.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (56).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 418243 + ... + 421309.

It is an arithmetic number, because the mean of its divisors is an integer number (52211224).

Almost surely, 2^1287452992 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1287452992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1461914272).

1287452992 is an abundant number, since it is smaller than the sum of its proper divisors (1636375552).

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

1287452992 is an equidigital number, since it uses as much as digits as its factorization.

1287452992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4023 (or 4013 counting only the distinct ones).

The product of its digits is 725760, while the sum is 49.

The square root of 1287452992 is about 35881.0951895284. The cubic root of 1287452992 is about 1087.8703168673.

The spelling of 1287452992 in words is "one billion, two hundred eighty-seven million, four hundred fifty-two thousand, nine hundred ninety-two".