32172138 has 12 divisors (see below), whose sum is σ = 69706338. Its totient is φ = 10724040.

The previous prime is 32172137. The next prime is 32172139. The reversal of 32172138 is 83127123.

It is an interprime number because it is at equal distance from previous prime (32172137) and next prime (32172139).

It can be written as a sum of positive squares in only one way, i.e., 30107169 + 2064969 = 5487^2 + 1437^2 .

It is not an unprimeable number, because it can be changed into a prime (32172137) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 893653 + ... + 893688.

Almost surely, 2^32172138 is an apocalyptic number.

32172138 is an abundant number, since it is smaller than the sum of its proper divisors (37534200).

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

32172138 is a wasteful number, since it uses less digits than its factorization.

32172138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1787349 (or 1787346 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 32172138 is about 5672.0488361790. The cubic root of 32172138 is about 318.0484677519.

The spelling of 32172138 in words is "thirty-two million, one hundred seventy-two thousand, one hundred thirty-eight".