1209797056 has 112 divisors (see below), whose sum is σ = 2720083968. Its totient is φ = 529689600.

The previous prime is 1209797053. The next prime is 1209797063. The reversal of 1209797056 is 6507979021.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is a junction number, because it is equal to n+sod(n) for n = 1209796997 and 1209797015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1209797053) 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, 3654811 + ... + 3655141.

It is an arithmetic number, because the mean of its divisors is an integer number (24286464).

Almost surely, 2^1209797056 is an apocalyptic number.

1209797056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1209797056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1360041984).

1209797056 is an abundant number, since it is smaller than the sum of its proper divisors (1510286912).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1209797056 is a wasteful number, since it uses less digits than its factorization.

1209797056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 570 (or 560 counting only the distinct ones).

The product of its (nonzero) digits is 238140, while the sum is 46.

The square root of 1209797056 is about 34782.1370246280. The cubic root of 1209797056 is about 1065.5426583446.

The spelling of 1209797056 in words is "one billion, two hundred nine million, seven hundred ninety-seven thousand, fifty-six".