172405427 has 4 divisors (see below), whose sum is σ = 172483680. Its totient is φ = 172327176.

The previous prime is 172405391. The next prime is 172405433. The reversal of 172405427 is 724504271.

172405427 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 172405427 - 2¹⁰ = 172404403 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 172405393 and 172405402.

It is not an unprimeable number, because it can be changed into a prime (172405327) 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, 35723 + ... + 40260.

It is an arithmetic number, because the mean of its divisors is an integer number (43120920).

Almost surely, 2^172405427 is an apocalyptic number.

172405427 is a deficient number, since it is larger than the sum of its proper divisors (78253).

172405427 is an equidigital number, since it uses as much as digits as its factorization.

172405427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78252.

The product of its (nonzero) digits is 15680, while the sum is 32.

The square root of 172405427 is about 13130.3247103794. The cubic root of 172405427 is about 556.5663911952.

Adding to 172405427 its reverse (724504271), we get a palindrome (896909698).

The spelling of 172405427 in words is "one hundred seventy-two million, four hundred five thousand, four hundred twenty-seven".