3998919 has 4 divisors (see below), whose sum is σ = 5331896. Its totient is φ = 2665944.

The previous prime is 3998899. The next prime is 3998959. The reversal of 3998919 is 9198993.

3998919 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 3998919 - 2¹⁷ = 3867847 is a prime.

It is a super-2 number, since 2×3998919² = 31982706337122, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3998959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 666484 + ... + 666489.

It is an arithmetic number, because the mean of its divisors is an integer number (1332974).

Almost surely, 2^3998919 is an apocalyptic number.

3998919 is a deficient number, since it is larger than the sum of its proper divisors (1332977).

3998919 is a wasteful number, since it uses less digits than its factorization.

3998919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1332976.

The product of its digits is 157464, while the sum is 48.

The square root of 3998919 is about 1999.7297317388. The cubic root of 3998919 is about 158.7258040706.

The spelling of 3998919 in words is "three million, nine hundred ninety-eight thousand, nine hundred nineteen".