172138284 has 72 divisors (see below), whose sum is σ = 453391120. Its totient is φ = 57106944.

The previous prime is 172138273. The next prime is 172138297. The reversal of 172138284 is 482831271.

172138284 = 402² + 403² + ... + 834².

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 397332 + ... + 397764.

Almost surely, 2^172138284 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 172138284, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (226695560).

172138284 is an abundant number, since it is smaller than the sum of its proper divisors (281252836).

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

172138284 is a wasteful number, since it uses less digits than its factorization.

172138284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 861 (or 847 counting only the distinct ones).

The product of its digits is 21504, while the sum is 36.

The square root of 172138284 is about 13120.1480174577. The cubic root of 172138284 is about 556.2787751979.

The spelling of 172138284 in words is "one hundred seventy-two million, one hundred thirty-eight thousand, two hundred eighty-four".