1290788944 has 20 divisors (see below), whose sum is σ = 2503557396. Its totient is φ = 644709632.

The previous prime is 1290788923. The next prime is 1290788951. The reversal of 1290788944 is 4498870921.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 254721600 + 1036067344 = 15960^2 + 32188^2 .

It is a super-2 number, since 2×1290788944² = 3332272195905270272, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1290788891 and 1290788900.

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, 27079 + ... + 57574.

Almost surely, 2^1290788944 is an apocalyptic number.

It is an amenable number.

1290788944 is a deficient number, since it is larger than the sum of its proper divisors (1212768452).

1290788944 is an equidigital number, since it uses as much as digits as its factorization.

1290788944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85614 (or 85608 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 52.

The square root of 1290788944 is about 35927.5513220704. The cubic root of 1290788944 is about 1088.8091092520.

The spelling of 1290788944 in words is "one billion, two hundred ninety million, seven hundred eighty-eight thousand, nine hundred forty-four".