172044012 has 144 divisors (see below), whose sum is σ = 514384640. Its totient is φ = 43711488.

The previous prime is 172044011. The next prime is 172044073. The reversal of 172044012 is 210440271.

It is a happy number.

It is a super-2 number, since 2×172044012² = 59198284130112288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 172044012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172044011) 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 47 ways as a sum of consecutive naturals, for example, 461058 + ... + 461430.

Almost surely, 2^172044012 is an apocalyptic number.

172044012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 172044012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (257192320).

172044012 is an abundant number, since it is smaller than the sum of its proper divisors (342340628).

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

172044012 is a wasteful number, since it uses less digits than its factorization.

172044012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 440 (or 421 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 21.

The square root of 172044012 is about 13116.5548830476. The cubic root of 172044012 is about 556.1772074590.

Adding to 172044012 its reverse (210440271), we get a palindrome (382484283).

The spelling of 172044012 in words is "one hundred seventy-two million, forty-four thousand, twelve".