1287922944 has 288 divisors, whose sum is σ = 4426813440. Its totient is φ = 322560000.

The previous prime is 1287922939. The next prime is 1287922981. The reversal of 1287922944 is 4492297821.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a junction number, because it is equal to n+sod(n) for n = 1287922893 and 1287922902.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1714569 + ... + 1715319.

It is an arithmetic number, because the mean of its divisors is an integer number (15370880).

Almost surely, 2^1287922944 is an apocalyptic number.

1287922944 is a gapful number since it is divisible by the number (14) 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 1287922944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2213406720).

1287922944 is an abundant number, since it is smaller than the sum of its proper divisors (3138890496).

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

1287922944 is a wasteful number, since it uses less digits than its factorization.

1287922944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 817 (or 803 counting only the distinct ones).

The product of its digits is 580608, while the sum is 48.

The square root of 1287922944 is about 35887.6433330471. The cubic root of 1287922944 is about 1088.0026672368.

The spelling of 1287922944 in words is "one billion, two hundred eighty-seven million, nine hundred twenty-two thousand, nine hundred forty-four".