172400307 has 4 divisors (see below), whose sum is σ = 229867080. Its totient is φ = 114933536.

The previous prime is 172400303. The next prime is 172400309. The reversal of 172400307 is 703004271.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 703004271 = 3 ⋅234334757.

It is a cyclic number.

It is not a de Polignac number, because 172400307 - 2² = 172400303 is a prime.

It is not an unprimeable number, because it can be changed into a prime (172400303) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28733382 + ... + 28733387.

It is an arithmetic number, because the mean of its divisors is an integer number (57466770).

Almost surely, 2^172400307 is an apocalyptic number.

172400307 is a deficient number, since it is larger than the sum of its proper divisors (57466773).

172400307 is an equidigital number, since it uses as much as digits as its factorization.

172400307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57466772.

The product of its (nonzero) digits is 1176, while the sum is 24.

The square root of 172400307 is about 13130.1297404100. The cubic root of 172400307 is about 556.5608816082.

Adding to 172400307 its reverse (703004271), we get a palindrome (875404578).

The spelling of 172400307 in words is "one hundred seventy-two million, four hundred thousand, three hundred seven".