438819869 has 2 divisors, whose sum is σ = 438819870. Its totient is φ = 438819868.

The previous prime is 438819847. The next prime is 438819883. The reversal of 438819869 is 968918834.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 263575225 + 175244644 = 16235^2 + 13238^2 .

It is a cyclic number.

It is not a de Polignac number, because 438819869 - 2²⁰ = 437771293 is a prime.

It is a super-2 number, since 2×438819869² = 385125754858354322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (438869869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 219409934 + 219409935.

It is an arithmetic number, because the mean of its divisors is an integer number (219409935).

Almost surely, 2^438819869 is an apocalyptic number.

It is an amenable number.

438819869 is a deficient number, since it is larger than the sum of its proper divisors (1).

438819869 is an equidigital number, since it uses as much as digits as its factorization.

438819869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2985984, while the sum is 56.

The square root of 438819869 is about 20948.0278069321. The cubic root of 438819869 is about 759.9098860145.

The spelling of 438819869 in words is "four hundred thirty-eight million, eight hundred nineteen thousand, eight hundred sixty-nine".