172172240 has 20 divisors (see below), whose sum is σ = 400300644. Its totient is φ = 68868864.

The previous prime is 172172201. The next prime is 172172257. The reversal of 172172240 is 42271271.

It can be written as a sum of positive squares in 2 ways, for example, as 136983616 + 35188624 = 11704^2 + 5932^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1075997 + ... + 1076156.

Almost surely, 2^172172240 is an apocalyptic number.

172172240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

172172240 is an abundant number, since it is smaller than the sum of its proper divisors (228128404).

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

172172240 is a wasteful number, since it uses less digits than its factorization.

172172240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2152166 (or 2152160 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 26.

The square root of 172172240 is about 13121.4419939273. The cubic root of 172172240 is about 556.3153499790.

The spelling of 172172240 in words is "one hundred seventy-two million, one hundred seventy-two thousand, two hundred forty".