1209821079 has 16 divisors (see below), whose sum is σ = 1665305312. Its totient is φ = 780668928.

The previous prime is 1209821057. The next prime is 1209821087. The reversal of 1209821079 is 9701289021.

It is not a de Polignac number, because 1209821079 - 2⁵ = 1209821047 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 (1209821579) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6814 + ... + 49659.

It is an arithmetic number, because the mean of its divisors is an integer number (104081582).

Almost surely, 2^1209821079 is an apocalyptic number.

1209821079 is a deficient number, since it is larger than the sum of its proper divisors (455484233).

1209821079 is a wasteful number, since it uses less digits than its factorization.

1209821079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56706.

The product of its (nonzero) digits is 18144, while the sum is 39.

The square root of 1209821079 is about 34782.4823582216. The cubic root of 1209821079 is about 1065.5497111424.

The spelling of 1209821079 in words is "one billion, two hundred nine million, eight hundred twenty-one thousand, seventy-nine".