3983781 has 8 divisors (see below), whose sum is σ = 5339200. Its totient is φ = 2642112.

The previous prime is 3983773. The next prime is 3983789. The reversal of 3983781 is 1873893.

It is an interprime number because it is at equal distance from previous prime (3983773) and next prime (3983789).

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

It is not a de Polignac number, because 3983781 - 2³ = 3983773 is a prime.

It is a super-2 number, since 2×3983781² = 31741022111922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3983789) 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, 2740 + ... + 3933.

It is an arithmetic number, because the mean of its divisors is an integer number (667400).

Almost surely, 2^3983781 is an apocalyptic number.

It is an amenable number.

3983781 is a deficient number, since it is larger than the sum of its proper divisors (1355419).

3983781 is a wasteful number, since it uses less digits than its factorization.

3983781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6875.

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

The square root of 3983781 is about 1995.9411313964. The cubic root of 3983781 is about 158.5252640785.

Subtracting from 3983781 its product of digits (36288), we obtain a palindrome (3947493).

The spelling of 3983781 in words is "three million, nine hundred eighty-three thousand, seven hundred eighty-one".