3873981 has 4 divisors (see below), whose sum is σ = 5165312. Its totient is φ = 2582652.

The previous prime is 3873941. The next prime is 3873983. The reversal of 3873981 is 1893783.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-3873981 is a prime.

It is a super-2 number, since 2×3873981² = 30015457576722, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

3873981 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3873983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 645661 + ... + 645666.

It is an arithmetic number, because the mean of its divisors is an integer number (1291328).

Almost surely, 2^3873981 is an apocalyptic number.

It is an amenable number.

3873981 is a deficient number, since it is larger than the sum of its proper divisors (1291331).

3873981 is a wasteful number, since it uses less digits than its factorization.

3873981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1291330.

The product of its digits is 36288, while the sum is 39.

The square root of 3873981 is about 1968.2431252261. The cubic root of 3873981 is about 157.0552633829.

The spelling of 3873981 in words is "three million, eight hundred seventy-three thousand, nine hundred eighty-one".