1287767442 has 64 divisors (see below), whose sum is σ = 3008565504. Its totient is φ = 363816960.

The previous prime is 1287767419. The next prime is 1287767477. The reversal of 1287767442 is 2447677821.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 1287767391 and 1287767400.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 42523 + ... + 66209.

It is an arithmetic number, because the mean of its divisors is an integer number (47008836).

Almost surely, 2^1287767442 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1287767442, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1504282752).

1287767442 is an abundant number, since it is smaller than the sum of its proper divisors (1720798062).

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

1287767442 is a wasteful number, since it uses less digits than its factorization.

1287767442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23763.

The product of its digits is 1053696, while the sum is 48.

The square root of 1287767442 is about 35885.4767559245. The cubic root of 1287767442 is about 1087.9588775052.

The spelling of 1287767442 in words is "one billion, two hundred eighty-seven million, seven hundred sixty-seven thousand, four hundred forty-two".