1288939 has 2 divisors, whose sum is σ = 1288940. Its totient is φ = 1288938.

The previous prime is 1288933. The next prime is 1288951. The reversal of 1288939 is 9398821.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1288939 is a prime.

It is a super-2 number, since 2×1288939² = 3322727491442, which contains 22 as substring.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (1288933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 644469 + 644470.

It is an arithmetic number, because the mean of its divisors is an integer number (644470).

2^1288939 is an apocalyptic number.

1288939 is a deficient number, since it is larger than the sum of its proper divisors (1).

1288939 is an equidigital number, since it uses as much as digits as its factorization.

1288939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 40.

The square root of 1288939 is about 1135.3144938738. The cubic root of 1288939 is about 108.8288704292.

The spelling of 1288939 in words is "one million, two hundred eighty-eight thousand, nine hundred thirty-nine".