172211540 has 24 divisors (see below), whose sum is σ = 367575432. Its totient is φ = 67754880.

The previous prime is 172211539. The next prime is 172211551. The reversal of 172211540 is 45112271.

172211540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 391876 + 171819664 = 626^2 + 13108^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69359 + ... + 71798.

It is an arithmetic number, because the mean of its divisors is an integer number (15315643).

Almost surely, 2^172211540 is an apocalyptic number.

172211540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

172211540 is an abundant number, since it is smaller than the sum of its proper divisors (195363892).

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

172211540 is a wasteful number, since it uses less digits than its factorization.

172211540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141227 (or 141225 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 23.

The square root of 172211540 is about 13122.9394573015. The cubic root of 172211540 is about 556.3576749012.

The spelling of 172211540 in words is "one hundred seventy-two million, two hundred eleven thousand, five hundred forty".