172840887 has 12 divisors (see below), whose sum is σ = 264345120. Its totient is φ = 108449088.

The previous prime is 172840879. The next prime is 172840919. The reversal of 172840887 is 788048271.

It is not a de Polignac number, because 172840887 - 2³ = 172840879 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172840807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 564687 + ... + 564992.

It is an arithmetic number, because the mean of its divisors is an integer number (22028760).

Almost surely, 2^172840887 is an apocalyptic number.

172840887 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

172840887 is a deficient number, since it is larger than the sum of its proper divisors (91504233).

172840887 is a wasteful number, since it uses less digits than its factorization.

172840887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1129702 (or 1129699 counting only the distinct ones).

The product of its (nonzero) digits is 200704, while the sum is 45.

The square root of 172840887 is about 13146.8964778764. The cubic root of 172840887 is about 557.0345872734.

The spelling of 172840887 in words is "one hundred seventy-two million, eight hundred forty thousand, eight hundred eighty-seven".