1288399433 has 4 divisors (see below), whose sum is σ = 1296303888. Its totient is φ = 1280494980.

The previous prime is 1288399421. The next prime is 1288399439. The reversal of 1288399433 is 3349938821.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 3349938821 = 11689 ⋅286589.

It is a cyclic number.

It is not a de Polignac number, because 1288399433 - 2¹⁴ = 1288383049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1288399439) 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, 3951983 + ... + 3952308.

It is an arithmetic number, because the mean of its divisors is an integer number (324075972).

Almost surely, 2^1288399433 is an apocalyptic number.

It is an amenable number.

1288399433 is a deficient number, since it is larger than the sum of its proper divisors (7904455).

1288399433 is an equidigital number, since it uses as much as digits as its factorization.

1288399433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7904454.

The product of its digits is 1119744, while the sum is 50.

The square root of 1288399433 is about 35894.2813411830. The cubic root of 1288399433 is about 1088.1368257245.

The spelling of 1288399433 in words is "one billion, two hundred eighty-eight million, three hundred ninety-nine thousand, four hundred thirty-three".