172400506 has 8 divisors (see below), whose sum is σ = 258866784. Its totient is φ = 86111580.

The previous prime is 172400497. The next prime is 172400533. The reversal of 172400506 is 605004271.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41880 + ... + 45811.

It is an arithmetic number, because the mean of its divisors is an integer number (32358348).

Almost surely, 2^172400506 is an apocalyptic number.

172400506 is a deficient number, since it is larger than the sum of its proper divisors (86466278).

172400506 is an equidigital number, since it uses as much as digits as its factorization.

172400506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88676.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 172400506 is about 13130.1373183985. The cubic root of 172400506 is about 556.5610957524.

Adding to 172400506 its reverse (605004271), we get a palindrome (777404777).

The spelling of 172400506 in words is "one hundred seventy-two million, four hundred thousand, five hundred six".