172205140 has 24 divisors (see below), whose sum is σ = 377354880. Its totient is φ = 65887008.

The previous prime is 172205119. The next prime is 172205147. The reversal of 172205140 is 41502271.

It is a happy number.

It is a super-2 number, since 2×172205140² = 59309220484839200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172205147) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 186720 + ... + 187639.

It is an arithmetic number, because the mean of its divisors is an integer number (15723120).

Almost surely, 2^172205140 is an apocalyptic number.

172205140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

172205140 is an abundant number, since it is smaller than the sum of its proper divisors (205149740).

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

172205140 is a wasteful number, since it uses less digits than its factorization.

172205140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 374391 (or 374389 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 172205140 is about 13122.6956072295. The cubic root of 172205140 is about 556.3507827320.

The spelling of 172205140 in words is "one hundred seventy-two million, two hundred five thousand, one hundred forty".