1288390322 has 18 divisors (see below), whose sum is σ = 2054330103. Its totient is φ = 605895232.

The previous prime is 1288390307. The next prime is 1288390351. The reversal of 1288390322 is 2230938821.

It can be written as a sum of positive squares in 5 ways, for example, as 1282284481 + 6105841 = 35809^2 + 2471^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=25381.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 862208 + ... + 863700.

Almost surely, 2^1288390322 is an apocalyptic number.

1288390322 is a deficient number, since it is larger than the sum of its proper divisors (765939781).

1288390322 is an frugal number, since it uses more digits than its factorization.

1288390322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3022 (or 1512 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 1288390322 is about 35894.1544265915. The cubic root of 1288390322 is about 1088.1342607751.

Multiplying 1288390322 by its product of nonzero digits (41472), we get a square (53432123433984 = 7309728²).

The spelling of 1288390322 in words is "one billion, two hundred eighty-eight million, three hundred ninety thousand, three hundred twenty-two".