812172 has 24 divisors (see below), whose sum is σ = 1932336. Its totient is φ = 265408.

The previous prime is 812167. The next prime is 812173. The reversal of 812172 is 271218.

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (812173) by changing a digit.

812172 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3 + ... + 1274.

It is an arithmetic number, because the mean of its divisors is an integer number (80514).

2⁸¹²¹⁷² is an apocalyptic number.

It is an amenable number.

812172 is an abundant number, since it is smaller than the sum of its proper divisors (1120164).

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

812172 is a wasteful number, since it uses less digits than its factorization.

812172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1337 (or 1335 counting only the distinct ones).

The product of its digits is 224, while the sum is 21.

The square root of 812172 is about 901.2058588358. The cubic root of 812172 is about 93.3002206800.

The spelling of 812172 in words is "eight hundred twelve thousand, one hundred seventy-two".