172401906 has 16 divisors (see below), whose sum is σ = 345139200. Its totient is φ = 57411408.

The previous prime is 172401899. The next prime is 172401919. The reversal of 172401906 is 609104271.

It is a happy number.

It is a Curzon number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 7026 + ... + 19853.

It is an arithmetic number, because the mean of its divisors is an integer number (21571200).

Almost surely, 2^172401906 is an apocalyptic number.

172401906 is an abundant number, since it is smaller than the sum of its proper divisors (172737294).

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

172401906 is a wasteful number, since it uses less digits than its factorization.

172401906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27953.

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 172401906 is about 13130.1906307563. The cubic root of 172401906 is about 556.5626022898.

The spelling of 172401906 in words is "one hundred seventy-two million, four hundred one thousand, nine hundred six".