3998681 has 8 divisors (see below), whose sum is σ = 4082400. Its totient is φ = 3916000.

The previous prime is 3998677. The next prime is 3998693. The reversal of 3998681 is 1868993.

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

It is not a de Polignac number, because 3998681 - 2² = 3998677 is a prime.

It is a super-2 number, since 2×3998681² = 31978899479522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3998641) 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, 15806 + ... + 16056.

It is an arithmetic number, because the mean of its divisors is an integer number (510300).

Almost surely, 2^3998681 is an apocalyptic number.

It is an amenable number.

3998681 is a deficient number, since it is larger than the sum of its proper divisors (83719).

3998681 is a wasteful number, since it uses less digits than its factorization.

3998681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 519.

The product of its digits is 93312, while the sum is 44.

The square root of 3998681 is about 1999.6702228118. The cubic root of 3998681 is about 158.7226550954.

The spelling of 3998681 in words is "three million, nine hundred ninety-eight thousand, six hundred eighty-one".