1287993424 has 10 divisors (see below), whose sum is σ = 2495487290. Its totient is φ = 643996704.

The previous prime is 1287993409. The next prime is 1287993433. The reversal of 1287993424 is 4243997821.

It can be written as a sum of positive squares in only one way, i.e., 1279349824 + 8643600 = 35768^2 + 2940^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40249779 + ... + 40249810.

It is an arithmetic number, because the mean of its divisors is an integer number (249548729).

Almost surely, 2^1287993424 is an apocalyptic number.

It is an amenable number.

1287993424 is a deficient number, since it is larger than the sum of its proper divisors (1207493866).

1287993424 is an equidigital number, since it uses as much as digits as its factorization.

1287993424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80499597 (or 80499591 counting only the distinct ones).

The product of its digits is 870912, while the sum is 49.

The square root of 1287993424 is about 35888.6252731976. The cubic root of 1287993424 is about 1088.0225134110.

The spelling of 1287993424 in words is "one billion, two hundred eighty-seven million, nine hundred ninety-three thousand, four hundred twenty-four".