3819981 has 8 divisors (see below), whose sum is σ = 5556384. Its totient is φ = 2315120.

The previous prime is 3819979. The next prime is 3819983. The reversal of 3819981 is 1899183.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (3819979) and next prime (3819983).

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 3819981 - 2¹ = 3819979 is a prime.

It is a super-2 number, since 2×3819981² = 29184509680722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3819983) 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, 57846 + ... + 57911.

It is an arithmetic number, because the mean of its divisors is an integer number (694548).

Almost surely, 2^3819981 is an apocalyptic number.

It is an amenable number.

3819981 is a deficient number, since it is larger than the sum of its proper divisors (1736403).

3819981 is a wasteful number, since it uses less digits than its factorization.

3819981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115771.

The product of its digits is 15552, while the sum is 39.

The square root of 3819981 is about 1954.4771679403. The cubic root of 3819981 is about 156.3221073050.

The spelling of 3819981 in words is "three million, eight hundred nineteen thousand, nine hundred eighty-one".