3998438069 has 2 divisors, whose sum is σ = 3998438070. Its totient is φ = 3998438068.

The previous prime is 3998438051. The next prime is 3998438111. The reversal of 3998438069 is 9608348993.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3473569969 + 524868100 = 58937^2 + 22910^2 .

It is an emirp because it is prime and its reverse (9608348993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3998438069 - 2⁸ = 3998437813 is a prime.

It is a super-2 number, since 2×3998438069² = 31975013983256897522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 3998437999 and 3998438017.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3998438009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1999219034 + 1999219035.

It is an arithmetic number, because the mean of its divisors is an integer number (1999219035).

Almost surely, 2^3998438069 is an apocalyptic number.

It is an amenable number.

3998438069 is a deficient number, since it is larger than the sum of its proper divisors (1).

3998438069 is an equidigital number, since it uses as much as digits as its factorization.

3998438069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10077696, while the sum is 59.

The square root of 3998438069 is about 63233.2038489273. The cubic root of 3998438069 is about 1587.1944074928.

The spelling of 3998438069 in words is "three billion, nine hundred ninety-eight million, four hundred thirty-eight thousand, sixty-nine".