438225421 has 2 divisors, whose sum is σ = 438225422. Its totient is φ = 438225420.

The previous prime is 438225379. The next prime is 438225433. The reversal of 438225421 is 124522834.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 340808521 + 97416900 = 18461^2 + 9870^2 .

It is a cyclic number.

It is not a de Polignac number, because 438225421 - 2⁹ = 438224909 is a prime.

It is a super-2 number, since 2×438225421² = 384083039221254482, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (438225451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 219112710 + 219112711.

It is an arithmetic number, because the mean of its divisors is an integer number (219112711).

Almost surely, 2^438225421 is an apocalyptic number.

It is an amenable number.

438225421 is a deficient number, since it is larger than the sum of its proper divisors (1).

438225421 is an equidigital number, since it uses as much as digits as its factorization.

438225421 is an evil number, because the sum of its binary digits is even.

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

The square root of 438225421 is about 20933.8343597154. The cubic root of 438225421 is about 759.5665932612.

The spelling of 438225421 in words is "four hundred thirty-eight million, two hundred twenty-five thousand, four hundred twenty-one".