438574921 has 2 divisors, whose sum is σ = 438574922. Its totient is φ = 438574920.

The previous prime is 438574897. The next prime is 438574957. The reversal of 438574921 is 129475834.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 403005625 + 35569296 = 20075^2 + 5964^2 .

It is a cyclic number.

It is not a de Polignac number, because 438574921 - 2⁷ = 438574793 is a prime.

It is a super-2 number, since 2×438574921² = 384695922660312482, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (438574121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 219287460 + 219287461.

It is an arithmetic number, because the mean of its divisors is an integer number (219287461).

Almost surely, 2^438574921 is an apocalyptic number.

It is an amenable number.

438574921 is a deficient number, since it is larger than the sum of its proper divisors (1).

438574921 is an equidigital number, since it uses as much as digits as its factorization.

438574921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 241920, while the sum is 43.

The square root of 438574921 is about 20942.1804261161. The cubic root of 438574921 is about 759.7684665205.

The spelling of 438574921 in words is "four hundred thirty-eight million, five hundred seventy-four thousand, nine hundred twenty-one".