1287242472 has 64 divisors (see below), whose sum is σ = 3370896000. Its totient is φ = 408852224.

The previous prime is 1287242461. The next prime is 1287242503. The reversal of 1287242472 is 2742427821.

It is a self number, because there is not a number n which added to its sum of digits gives 1287242472.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 144154 + ... + 152822.

It is an arithmetic number, because the mean of its divisors is an integer number (52670250).

Almost surely, 2^1287242472 is an apocalyptic number.

1287242472 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1287242472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1685448000).

1287242472 is an abundant number, since it is smaller than the sum of its proper divisors (2083653528).

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

1287242472 is a wasteful number, since it uses less digits than its factorization.

1287242472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8970 (or 8966 counting only the distinct ones).

The product of its digits is 100352, while the sum is 39.

The square root of 1287242472 is about 35878.1614913585. The cubic root of 1287242472 is about 1087.8110186652.

The spelling of 1287242472 in words is "one billion, two hundred eighty-seven million, two hundred forty-two thousand, four hundred seventy-two".