816172 has 24 divisors (see below), whose sum is σ = 1654016. Its totient is φ = 345168.

The previous prime is 816169. The next prime is 816191. The reversal of 816172 is 271618.

It is a super-2 number, since 2×816172² = 1332273467168, which contains 22 as substring.

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2743 + ... + 3025.

2⁸¹⁶¹⁷² is an apocalyptic number.

It is an amenable number.

816172 is an abundant number, since it is smaller than the sum of its proper divisors (837844).

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

816172 is a wasteful number, since it uses less digits than its factorization.

816172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397 (or 395 counting only the distinct ones).

The product of its digits is 672, while the sum is 25.

The square root of 816172 is about 903.4223818348. The cubic root of 816172 is about 93.4531397965.

The spelling of 816172 in words is "eight hundred sixteen thousand, one hundred seventy-two".