8172138 has 32 divisors (see below), whose sum is σ = 18639936. Its totient is φ = 2366208.

The previous prime is 8172137. The next prime is 8172139. The reversal of 8172138 is 8312718.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (8172137) and next prime (8172139).

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (8172137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1756 + ... + 4407.

It is an arithmetic number, because the mean of its divisors is an integer number (582498).

Almost surely, 2^8172138 is an apocalyptic number.

8172138 is an abundant number, since it is smaller than the sum of its proper divisors (10467798).

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

8172138 is a wasteful number, since it uses less digits than its factorization.

8172138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6198.

The product of its digits is 2688, while the sum is 30.

The square root of 8172138 is about 2858.6951568854. The cubic root of 8172138 is about 201.4243158758.

The spelling of 8172138 in words is "eight million, one hundred seventy-two thousand, one hundred thirty-eight".