816172406 has 16 divisors (see below), whose sum is σ = 1418860800. Its totient is φ = 344861160.

The previous prime is 816172393. The next prime is 816172421. The reversal of 816172406 is 604271618.

It is a super-2 number, since 2×816172406² = 1332274792631657672, which contains 22 as substring.

It is a congruent 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, 409556 + ... + 411543.

It is an arithmetic number, because the mean of its divisors is an integer number (88678800).

Almost surely, 2^816172406 is an apocalyptic number.

816172406 is a deficient number, since it is larger than the sum of its proper divisors (602688394).

816172406 is a wasteful number, since it uses less digits than its factorization.

816172406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 821179.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 816172406 is about 28568.7312633935. The cubic root of 816172406 is about 934.5315529244.

The spelling of 816172406 in words is "eight hundred sixteen million, one hundred seventy-two thousand, four hundred six".