438533869 has 2 divisors, whose sum is σ = 438533870. Its totient is φ = 438533868.

The previous prime is 438533867. The next prime is 438533873. The reversal of 438533869 is 968335834.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 280730025 + 157803844 = 16755^2 + 12562^2 .

It is a cyclic number.

It is not a de Polignac number, because 438533869 - 2¹ = 438533867 is a prime.

It is a super-2 number, since 2×438533869² = 384623908520218322, which contains 22 as substring.

Together with 438533867, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (438533861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 219266934 + 219266935.

It is an arithmetic number, because the mean of its divisors is an integer number (219266935).

Almost surely, 2^438533869 is an apocalyptic number.

It is an amenable number.

438533869 is a deficient number, since it is larger than the sum of its proper divisors (1).

438533869 is an equidigital number, since it uses as much as digits as its factorization.

438533869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1866240, while the sum is 49.

The square root of 438533869 is about 20941.2002760109. The cubic root of 438533869 is about 759.7447602035.

The spelling of 438533869 in words is "four hundred thirty-eight million, five hundred thirty-three thousand, eight hundred sixty-nine".