3998738669 has 8 divisors (see below), whose sum is σ = 4178925312. Its totient is φ = 3819079440.

The previous prime is 3998738659. The next prime is 3998738677. The reversal of 3998738669 is 9668378993.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3998738669 - 2⁸ = 3998738413 is a prime.

It is a super-2 number, since 2×3998738669² = 31979821885911783122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3998738599 and 3998738608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3998738659) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 116309 + ... + 146714.

It is an arithmetic number, because the mean of its divisors is an integer number (522365664).

Almost surely, 2^3998738669 is an apocalyptic number.

It is an amenable number.

3998738669 is a deficient number, since it is larger than the sum of its proper divisors (180186643).

3998738669 is a wasteful number, since it uses less digits than its factorization.

3998738669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263707.

The product of its digits is 105815808, while the sum is 68.

The square root of 3998738669 is about 63235.5807200345. The cubic root of 3998738669 is about 1587.2341812473.

The spelling of 3998738669 in words is "three billion, nine hundred ninety-eight million, seven hundred thirty-eight thousand, six hundred sixty-nine".