172208907 has 24 divisors (see below), whose sum is σ = 269833200. Its totient is φ = 105202368.

The previous prime is 172208891. The next prime is 172208923. The reversal of 172208907 is 709802271.

It is an interprime number because it is at equal distance from previous prime (172208891) and next prime (172208923).

It is not a de Polignac number, because 172208907 - 2⁴ = 172208891 is a prime.

It is not an unprimeable number, because it can be changed into a prime (172200907) 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 23 ways as a sum of consecutive naturals, for example, 10969 + ... + 21557.

It is an arithmetic number, because the mean of its divisors is an integer number (11243050).

Almost surely, 2^172208907 is an apocalyptic number.

172208907 is a deficient number, since it is larger than the sum of its proper divisors (97624293).

172208907 is a wasteful number, since it uses less digits than its factorization.

172208907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10747 (or 10744 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 36.

The square root of 172208907 is about 13122.8391364064. The cubic root of 172208907 is about 556.3548394404.

The spelling of 172208907 in words is "one hundred seventy-two million, two hundred eight thousand, nine hundred seven".