422438251 has 4 divisors (see below), whose sum is σ = 423001504. Its totient is φ = 421875000.

The previous prime is 422438231. The next prime is 422438279. The reversal of 422438251 is 152834224.

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

It is a 3-Lehmer number, since φ(422438251) divides (422438251-1)³.

It is a cyclic number.

It is not a de Polignac number, because 422438251 - 2¹⁹ = 421913963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (422438231) by changing a digit.

It is a nontrivial repunit in base 750.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 280500 + ... + 282001.

It is an arithmetic number, because the mean of its divisors is an integer number (105750376).

Almost surely, 2^422438251 is an apocalyptic number.

422438251 is a deficient number, since it is larger than the sum of its proper divisors (563253).

422438251 is an equidigital number, since it uses as much as digits as its factorization.

422438251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 563252.

The product of its digits is 15360, while the sum is 31.

The square root of 422438251 is about 20553.3026786451. The cubic root of 422438251 is about 750.3336299365. Note that the first 3 decimals are identical.

The spelling of 422438251 in words is "four hundred twenty-two million, four hundred thirty-eight thousand, two hundred fifty-one".