1288213239 has 4 divisors (see below), whose sum is σ = 1717617656. Its totient is φ = 858808824.

The previous prime is 1288213231. The next prime is 1288213247. The reversal of 1288213239 is 9323128821.

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

It is an interprime number because it is at equal distance from previous prime (1288213231) and next prime (1288213247).

It is not a de Polignac number, because 1288213239 - 2³ = 1288213231 is a prime.

It is a super-2 number, since 2×1288213239² = 3318986698269742242, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1288213197 and 1288213206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1288213231) 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, 214702204 + ... + 214702209.

It is an arithmetic number, because the mean of its divisors is an integer number (429404414).

Almost surely, 2^1288213239 is an apocalyptic number.

1288213239 is a deficient number, since it is larger than the sum of its proper divisors (429404417).

1288213239 is an equidigital number, since it uses as much as digits as its factorization.

1288213239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429404416.

The product of its digits is 41472, while the sum is 39.

The square root of 1288213239 is about 35891.6876031206. The cubic root of 1288213239 is about 1088.0844055656.

The spelling of 1288213239 in words is "one billion, two hundred eighty-eight million, two hundred thirteen thousand, two hundred thirty-nine".