1290728389 has 8 divisors (see below), whose sum is σ = 1307785248. Its totient is φ = 1273755600.

The previous prime is 1290728363. The next prime is 1290728393. The reversal of 1290728389 is 9838270921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1290728389 - 2⁹ = 1290727877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1290728359) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10194 + ... + 51820.

It is an arithmetic number, because the mean of its divisors is an integer number (163473156).

Almost surely, 2^1290728389 is an apocalyptic number.

It is an amenable number.

1290728389 is a deficient number, since it is larger than the sum of its proper divisors (17056859).

1290728389 is a wasteful number, since it uses less digits than its factorization.

1290728389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42035.

The product of its (nonzero) digits is 435456, while the sum is 49.

The square root of 1290728389 is about 35926.7085745410. The cubic root of 1290728389 is about 1088.7920824905.

The spelling of 1290728389 in words is "one billion, two hundred ninety million, seven hundred twenty-eight thousand, three hundred eighty-nine".