861422500 has 45 divisors (see below), whose sum is σ = 1886973319. Its totient is φ = 343982000.

The previous prime is 861422489. The next prime is 861422501. The reversal of 861422500 is 5224168.

The square root of 861422500 is 29350.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 2 ways, for example, as 67535524 + 793886976 = 8218^2 + 28176^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (861422501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 1467207 + ... + 1467793.

Almost surely, 2^861422500 is an apocalyptic number.

861422500 is the 29350-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 861422500

861422500 is an abundant number, since it is smaller than the sum of its proper divisors (1025550819).

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

861422500 is an frugal number, since it uses more digits than its factorization.

861422500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1198 (or 594 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 28.

The cubic root of 861422500 is about 951.4925752537.

Adding to 861422500 its reverse (5224168), we get a palindrome (866646668).

The spelling of 861422500 in words is "eight hundred sixty-one million, four hundred twenty-two thousand, five hundred".