816172386 has 8 divisors (see below), whose sum is σ = 1632344784. Its totient is φ = 272057460.

The previous prime is 816172373. The next prime is 816172391. The reversal of 816172386 is 683271618.

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

816172386 is an admirable number.

It is a super-2 number, since 2×816172386² = 1332274727337865992, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68014360 + ... + 68014371.

It is an arithmetic number, because the mean of its divisors is an integer number (204043098).

Almost surely, 2^816172386 is an apocalyptic number.

816172386 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

816172386 is a wasteful number, since it uses less digits than its factorization.

816172386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136028736.

The product of its digits is 96768, while the sum is 42.

The square root of 816172386 is about 28568.7309133605. The cubic root of 816172386 is about 934.5315452910.

The spelling of 816172386 in words is "eight hundred sixteen million, one hundred seventy-two thousand, three hundred eighty-six".