1206521860 has 48 divisors (see below), whose sum is σ = 2626186752. Its totient is φ = 465120000.

The previous prime is 1206521851. The next prime is 1206521903. The reversal of 1206521860 is 681256021.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is an unprimeable number.

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, 151744 + ... + 159496.

It is an arithmetic number, because the mean of its divisors is an integer number (54712224).

Almost surely, 2^1206521860 is an apocalyptic number.

1206521860 is a gapful number since it is divisible by the number (10) 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 1206521860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1313093376).

1206521860 is an abundant number, since it is smaller than the sum of its proper divisors (1419664892).

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

1206521860 is a wasteful number, since it uses less digits than its factorization.

1206521860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8044 (or 8042 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 1206521860 is about 34735.0235353310. The cubic root of 1206521860 is about 1064.5802338170.

Adding to 1206521860 its reverse (681256021), we get a palindrome (1887777881).

The spelling of 1206521860 in words is "one billion, two hundred six million, five hundred twenty-one thousand, eight hundred sixty".