861880226 has 4 divisors (see below), whose sum is σ = 1292820342. Its totient is φ = 430940112.

The previous prime is 861880199. The next prime is 861880247. The reversal of 861880226 is 622088168.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 792141025 + 69739201 = 28145^2 + 8351^2 .

It is a super-2 number, since 2×861880226² = 1485675047939622152, which contains 22 as substring.

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 as a sum of consecutive naturals, namely, 215470055 + ... + 215470058.

Almost surely, 2^861880226 is an apocalyptic number.

861880226 is a deficient number, since it is larger than the sum of its proper divisors (430940116).

861880226 is a wasteful number, since it uses less digits than its factorization.

861880226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430940115.

The product of its (nonzero) digits is 73728, while the sum is 41.

The square root of 861880226 is about 29357.7966816313. The cubic root of 861880226 is about 951.6610739766.

The spelling of 861880226 in words is "eight hundred sixty-one million, eight hundred eighty thousand, two hundred twenty-six".