1288450489 has 4 divisors (see below), whose sum is σ = 1330013440. Its totient is φ = 1246887540.

The previous prime is 1288450481. The next prime is 1288450507. The reversal of 1288450489 is 9840548821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1288450489 - 2³ = 1288450481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1288450481) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20781429 + ... + 20781490.

It is an arithmetic number, because the mean of its divisors is an integer number (332503360).

Almost surely, 2^1288450489 is an apocalyptic number.

It is an amenable number.

1288450489 is a deficient number, since it is larger than the sum of its proper divisors (41562951).

1288450489 is an equidigital number, since it uses as much as digits as its factorization.

1288450489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41562950.

The product of its (nonzero) digits is 737280, while the sum is 49.

The square root of 1288450489 is about 35894.9925337783. The cubic root of 1288450489 is about 1088.1511989016.

The spelling of 1288450489 in words is "one billion, two hundred eighty-eight million, four hundred fifty thousand, four hundred eighty-nine".