1200656500 has 48 divisors (see below), whose sum is σ = 2632003920. Its totient is φ = 478473600.

The previous prime is 1200656489. The next prime is 1200656581. The reversal of 1200656500 is 56560021.

It can be written as a sum of positive squares in 8 ways, for example, as 632120164 + 568536336 = 25142^2 + 23844^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 134166 + ... + 142834.

It is an arithmetic number, because the mean of its divisors is an integer number (54833415).

Almost surely, 2^1200656500 is an apocalyptic number.

1200656500 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 1200656500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1316001960).

1200656500 is an abundant number, since it is smaller than the sum of its proper divisors (1431347420).

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

1200656500 is a wasteful number, since it uses less digits than its factorization.

1200656500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8965 (or 8953 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 1200656500 is about 34650.4906170172. The cubic root of 1200656500 is about 1062.8523214514.

The spelling of 1200656500 in words is "one billion, two hundred million, six hundred fifty-six thousand, five hundred".