1289021787772 has 48 divisors (see below), whose sum is σ = 2401421904000. Its totient is φ = 603692512704.

The previous prime is 1289021787769. The next prime is 1289021787793. The reversal of 1289021787772 is 2777871209821.

It is a self number, because there is not a number n which added to its sum of digits gives 1289021787772.

It is a congruent number.

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, 3983479 + ... + 4294897.

It is an arithmetic number, because the mean of its divisors is an integer number (50029623000).

Almost surely, 2^{1289021787772} is an apocalyptic number.

It is an amenable number.

1289021787772 is a deficient number, since it is larger than the sum of its proper divisors (1112400116228).

1289021787772 is a wasteful number, since it uses less digits than its factorization.

1289021787772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312058 (or 312056 counting only the distinct ones).

The product of its (nonzero) digits is 11063808, while the sum is 61.

The spelling of 1289021787772 in words is "one trillion, two hundred eighty-nine billion, twenty-one million, seven hundred eighty-seven thousand, seven hundred seventy-two".