3998731 has 8 divisors (see below), whose sum is σ = 4402224. Its totient is φ = 3601920.

The previous prime is 3998719. The next prime is 3998737. The reversal of 3998731 is 1378993.

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 3998731 - 2⁹ = 3998219 is a prime.

It is a super-2 number, since 2×3998731² = 31979699220722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3998737) 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, 366 + ... + 2851.

It is an arithmetic number, because the mean of its divisors is an integer number (550278).

Almost surely, 2^3998731 is an apocalyptic number.

3998731 is a deficient number, since it is larger than the sum of its proper divisors (403493).

3998731 is a wasteful number, since it uses less digits than its factorization.

3998731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3341.

The product of its digits is 40824, while the sum is 40.

The square root of 3998731 is about 1999.6827248341. The cubic root of 3998731 is about 158.7233166552.

The spelling of 3998731 in words is "three million, nine hundred ninety-eight thousand, seven hundred thirty-one".