1288743349 has 8 divisors (see below), whose sum is σ = 1296947288. Its totient is φ = 1280551680.

The previous prime is 1288743341. The next prime is 1288743397. The reversal of 1288743349 is 9433478821.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 651249 + 1288092100 = 807^2 + 35890^2 .

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 1288743349 - 2³ = 1288743341 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 (1288743341) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 297769 + ... + 302065.

It is an arithmetic number, because the mean of its divisors is an integer number (162118411).

Almost surely, 2^1288743349 is an apocalyptic number.

It is an amenable number.

1288743349 is a deficient number, since it is larger than the sum of its proper divisors (8203939).

1288743349 is a wasteful number, since it uses less digits than its factorization.

1288743349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6135.

The product of its digits is 1161216, while the sum is 49.

The square root of 1288743349 is about 35899.0717010900. The cubic root of 1288743349 is about 1088.2336368950.

The spelling of 1288743349 in words is "one billion, two hundred eighty-eight million, seven hundred forty-three thousand, three hundred forty-nine".