172047018 has 64 divisors (see below), whose sum is σ = 406425600. Its totient is φ = 47866560.

The previous prime is 172046983. The next prime is 172047049. The reversal of 172047018 is 810740271.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 204643 + ... + 205481.

It is an arithmetic number, because the mean of its divisors is an integer number (6350400).

Almost surely, 2^172047018 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 172047018, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (203212800).

172047018 is an abundant number, since it is smaller than the sum of its proper divisors (234378582).

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

172047018 is a wasteful number, since it uses less digits than its factorization.

172047018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1107.

The product of its (nonzero) digits is 3136, while the sum is 30.

The square root of 172047018 is about 13116.6694705630. The cubic root of 172047018 is about 556.1804466668.

Adding to 172047018 its reverse (810740271), we get a palindrome (982787289).

The spelling of 172047018 in words is "one hundred seventy-two million, forty-seven thousand, eighteen".