812220190 has 8 divisors (see below), whose sum is σ = 1461996360. Its totient is φ = 324888072.

The previous prime is 812220133. The next prime is 812220193. The reversal of 812220190 is 91022218.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×812220190² = 1319403274087272200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812220193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40611000 + ... + 40611019.

It is an arithmetic number, because the mean of its divisors is an integer number (182749545).

Almost surely, 2^812220190 is an apocalyptic number.

812220190 is a deficient number, since it is larger than the sum of its proper divisors (649776170).

812220190 is a wasteful number, since it uses less digits than its factorization.

812220190 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81222026.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 812220190 is about 28499.4770127453. The cubic root of 812220190 is about 933.0206595777.

The spelling of 812220190 in words is "eight hundred twelve million, two hundred twenty thousand, one hundred ninety".