1239222009 has 16 divisors (see below), whose sum is σ = 1749326400. Its totient is φ = 778136256.

The previous prime is 1239221989. The next prime is 1239222011. The reversal of 1239222009 is 9002229321.

It is a happy number.

It is not a de Polignac number, because 1239222009 - 2¹⁵ = 1239189241 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1239202009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52974 + ... + 72695.

It is an arithmetic number, because the mean of its divisors is an integer number (109332900).

Almost surely, 2^1239222009 is an apocalyptic number.

1239222009 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1239222009 is a deficient number, since it is larger than the sum of its proper divisors (510104391).

1239222009 is a wasteful number, since it uses less digits than its factorization.

1239222009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125864.

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 1239222009 is about 35202.5852601766. The cubic root of 1239222009 is about 1074.1123399580.

The spelling of 1239222009 in words is "one billion, two hundred thirty-nine million, two hundred twenty-two thousand, nine".