172440421 has 8 divisors (see below), whose sum is σ = 176045760. Its totient is φ = 168857952.

The previous prime is 172440419. The next prime is 172440487. The reversal of 172440421 is 124044271.

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

It is a cyclic number.

It is not a de Polignac number, because 172440421 - 2¹ = 172440419 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172440491) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9961 + ... + 21073.

It is an arithmetic number, because the mean of its divisors is an integer number (22005720).

Almost surely, 2^172440421 is an apocalyptic number.

It is an amenable number.

172440421 is a deficient number, since it is larger than the sum of its proper divisors (3605339).

172440421 is a wasteful number, since it uses less digits than its factorization.

172440421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11435.

The product of its (nonzero) digits is 1792, while the sum is 25.

The square root of 172440421 is about 13131.6572069179. The cubic root of 172440421 is about 556.6040450113.

Adding to 172440421 its reverse (124044271), we get a palindrome (296484692).

The spelling of 172440421 in words is "one hundred seventy-two million, four hundred forty thousand, four hundred twenty-one".