172403421 has 4 divisors (see below), whose sum is σ = 229871232. Its totient is φ = 114935612.

The previous prime is 172403419. The next prime is 172403437. The reversal of 172403421 is 124304271.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 172403421 - 2¹ = 172403419 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 172403391 and 172403400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172403221) 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, 28733901 + ... + 28733906.

It is an arithmetic number, because the mean of its divisors is an integer number (57467808).

Almost surely, 2^172403421 is an apocalyptic number.

It is an amenable number.

172403421 is a deficient number, since it is larger than the sum of its proper divisors (57467811).

172403421 is an equidigital number, since it uses as much as digits as its factorization.

172403421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57467810.

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 172403421 is about 13130.2483220996. The cubic root of 172403421 is about 556.5642325692.

Adding to 172403421 its reverse (124304271), we get a palindrome (296707692).

The spelling of 172403421 in words is "one hundred seventy-two million, four hundred three thousand, four hundred twenty-one".