861822452 has 12 divisors (see below), whose sum is σ = 1522026660. Its totient is φ = 426957696.

The previous prime is 861822431. The next prime is 861822487. The reversal of 861822452 is 254228168.

It can be written as a sum of positive squares in 2 ways, for example, as 248566756 + 613255696 = 15766^2 + 24764^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 987893 + ... + 988764.

It is an arithmetic number, because the mean of its divisors is an integer number (126835555).

Almost surely, 2^861822452 is an apocalyptic number.

It is an amenable number.

861822452 is a deficient number, since it is larger than the sum of its proper divisors (660204208).

861822452 is a wasteful number, since it uses less digits than its factorization.

861822452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1976770 (or 1976768 counting only the distinct ones).

The product of its digits is 61440, while the sum is 38.

The square root of 861822452 is about 29356.8127016541. The cubic root of 861822452 is about 951.6398094227.

The spelling of 861822452 in words is "eight hundred sixty-one million, eight hundred twenty-two thousand, four hundred fifty-two".