1205156712 has 64 divisors (see below), whose sum is σ = 3149092800. Its totient is φ = 383846400.

The previous prime is 1205156677. The next prime is 1205156717. The reversal of 1205156712 is 2176515021.

It is a self number, because there is not a number n which added to its sum of digits gives 1205156712.

It is not an unprimeable number, because it can be changed into a prime (1205156717) 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, 58587 + ... + 76437.

It is an arithmetic number, because the mean of its divisors is an integer number (49204575).

Almost surely, 2^1205156712 is an apocalyptic number.

1205156712 is a gapful number since it is divisible by the number (12) 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 1205156712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1574546400).

1205156712 is an abundant number, since it is smaller than the sum of its proper divisors (1943936088).

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

1205156712 is a wasteful number, since it uses less digits than its factorization.

1205156712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17986 (or 17982 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 30.

The square root of 1205156712 is about 34715.3670872137. The cubic root of 1205156712 is about 1064.1785673692.

The spelling of 1205156712 in words is "one billion, two hundred five million, one hundred fifty-six thousand, seven hundred twelve".