3820981 has 4 divisors (see below), whose sum is σ = 3826764. Its totient is φ = 3815200.

The previous prime is 3820963. The next prime is 3820987. The reversal of 3820981 is 1890283.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1418481 + 2402500 = 1191^2 + 1550^2 .

It is a cyclic number.

It is not a de Polignac number, because 3820981 - 2⁷ = 3820853 is a prime.

It is a super-2 number, since 2×3820981² = 29199791604722, 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 (3820987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1750 + ... + 3271.

It is an arithmetic number, because the mean of its divisors is an integer number (956691).

Almost surely, 2^3820981 is an apocalyptic number.

It is an amenable number.

3820981 is a deficient number, since it is larger than the sum of its proper divisors (5783).

3820981 is an equidigital number, since it uses as much as digits as its factorization.

3820981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5782.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 3820981 is about 1954.7329740913. The cubic root of 3820981 is about 156.3357468552.

The spelling of 3820981 in words is "three million, eight hundred twenty thousand, nine hundred eighty-one".