1288121372 has 12 divisors (see below), whose sum is σ = 2265893616. Its totient is φ = 640723200.

The previous prime is 1288121363. The next prime is 1288121407. The reversal of 1288121372 is 2731218821.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 833504 + ... + 835047.

It is an arithmetic number, because the mean of its divisors is an integer number (188824468).

Almost surely, 2^1288121372 is an apocalyptic number.

It is an amenable number.

1288121372 is a deficient number, since it is larger than the sum of its proper divisors (977772244).

1288121372 is a wasteful number, since it uses less digits than its factorization.

1288121372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1668748 (or 1668746 counting only the distinct ones).

The product of its digits is 10752, while the sum is 35.

The square root of 1288121372 is about 35890.4077992992. The cubic root of 1288121372 is about 1088.0585399136.

The spelling of 1288121372 in words is "one billion, two hundred eighty-eight million, one hundred twenty-one thousand, three hundred seventy-two".