814191220 has 24 divisors (see below), whose sum is σ = 1710453024. Its totient is φ = 325552416.

The previous prime is 814191193. The next prime is 814191221. The reversal of 814191220 is 22191418.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (814191221) 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 7 ways as a sum of consecutive naturals, for example, 60859 + ... + 73021.

It is an arithmetic number, because the mean of its divisors is an integer number (71268876).

Almost surely, 2^814191220 is an apocalyptic number.

It is an amenable number.

814191220 is an abundant number, since it is smaller than the sum of its proper divisors (896261804).

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

814191220 is a wasteful number, since it uses less digits than its factorization.

814191220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15519 (or 15517 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 814191220 is about 28534.0361673563. The cubic root of 814191220 is about 933.7747761532.

The spelling of 814191220 in words is "eight hundred fourteen million, one hundred ninety-one thousand, two hundred twenty".