1288402267 has 4 divisors (see below), whose sum is σ = 1289584296. Its totient is φ = 1287220240.

The previous prime is 1288402237. The next prime is 1288402309. The reversal of 1288402267 is 7622048821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1288402267 - 2¹⁹ = 1287877979 is a prime.

It is a super-2 number, since 2×1288402267² = 3319960803221478578, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1288402207) 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, 589378 + ... + 591559.

It is an arithmetic number, because the mean of its divisors is an integer number (322396074).

Almost surely, 2^1288402267 is an apocalyptic number.

1288402267 is a deficient number, since it is larger than the sum of its proper divisors (1182029).

1288402267 is a wasteful number, since it uses less digits than its factorization.

1288402267 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1182028.

The product of its (nonzero) digits is 86016, while the sum is 40.

The square root of 1288402267 is about 35894.3208182019. The cubic root of 1288402267 is about 1088.1376235561.

The spelling of 1288402267 in words is "one billion, two hundred eighty-eight million, four hundred two thousand, two hundred sixty-seven".