3998815 has 8 divisors (see below), whose sum is σ = 4828320. Its totient is φ = 3179232.

The previous prime is 3998809. The next prime is 3998821. The reversal of 3998815 is 5188993.

It is an interprime number because it is at equal distance from previous prime (3998809) and next prime (3998821).

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3998815 is a prime.

3998815 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1560 + ... + 3229.

It is an arithmetic number, because the mean of its divisors is an integer number (603540).

Almost surely, 2^3998815 is an apocalyptic number.

3998815 is a deficient number, since it is larger than the sum of its proper divisors (829505).

3998815 is a wasteful number, since it uses less digits than its factorization.

3998815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4961.

The product of its digits is 77760, while the sum is 43.

The square root of 3998815 is about 1999.7037280557. The cubic root of 3998815 is about 158.7244280632.

The spelling of 3998815 in words is "three million, nine hundred ninety-eight thousand, eight hundred fifteen".