172017018 has 24 divisors (see below), whose sum is σ = 373347156. Its totient is φ = 57240000.

The previous prime is 172016989. The next prime is 172017019. The reversal of 172017018 is 810710271.

It can be written as a sum of positive squares in 2 ways, for example, as 126495009 + 45522009 = 11247^2 + 6747^2 .

It is a super-2 number, since 2×172017018² = 59179708963224648, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 172016982 and 172017000.

It is not an unprimeable number, because it can be changed into a prime (172017019) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2868 + ... + 18768.

Almost surely, 2^172017018 is an apocalyptic number.

172017018 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

172017018 is an abundant number, since it is smaller than the sum of its proper divisors (201330138).

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

172017018 is a wasteful number, since it uses less digits than its factorization.

172017018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16510 (or 16507 counting only the distinct ones).

The product of its (nonzero) digits is 784, while the sum is 27.

The square root of 172017018 is about 13115.5258377238. The cubic root of 172017018 is about 556.1481175522.

Adding to 172017018 its reverse (810710271), we get a palindrome (982727289).

The spelling of 172017018 in words is "one hundred seventy-two million, seventeen thousand, eighteen".