172081386 has 24 divisors (see below), whose sum is σ = 373176804. Its totient is φ = 57309120.

The previous prime is 172081373. The next prime is 172081391. The reversal of 172081386 is 683180271.

It can be written as a sum of positive squares in 2 ways, for example, as 153289161 + 18792225 = 12381^2 + 4335^2 .

It is a super-2 number, since 2×172081386² = 59224006815361992, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 172081386.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20160 + ... + 27396.

Almost surely, 2^172081386 is an apocalyptic number.

172081386 is an abundant number, since it is smaller than the sum of its proper divisors (201095418).

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

172081386 is a wasteful number, since it uses less digits than its factorization.

172081386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8566 (or 8563 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 172081386 is about 13117.9794938093. The cubic root of 172081386 is about 556.2174782821.

The spelling of 172081386 in words is "one hundred seventy-two million, eighty-one thousand, three hundred eighty-six".