1209120385 has 16 divisors (see below), whose sum is σ = 1666157760. Its totient is φ = 833077440.

The previous prime is 1209120383. The next prime is 1209120431. The reversal of 1209120385 is 5830219021.

It is not a de Polignac number, because 1209120385 - 2¹ = 1209120383 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1209120383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 577482 + ... + 579571.

It is an arithmetic number, because the mean of its divisors is an integer number (104134860).

Almost surely, 2^1209120385 is an apocalyptic number.

It is an amenable number.

1209120385 is a deficient number, since it is larger than the sum of its proper divisors (457037375).

1209120385 is a wasteful number, since it uses less digits than its factorization.

1209120385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1157088.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 1209120385 is about 34772.4083865354. The cubic root of 1209120385 is about 1065.3439593746.

The spelling of 1209120385 in words is "one billion, two hundred nine million, one hundred twenty thousand, three hundred eighty-five".