3981785 has 8 divisors (see below), whose sum is σ = 4844040. Its totient is φ = 3141504.

The previous prime is 3981767. The next prime is 3981821. The reversal of 3981785 is 5871893.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 183184 + 3798601 = 428^2 + 1949^2 .

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 3981785 - 2¹⁰ = 3980761 is a prime.

It is a super-2 number, since 2×3981785² = 31709223572450, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5090 + ... + 5819.

It is an arithmetic number, because the mean of its divisors is an integer number (605505).

Almost surely, 2^3981785 is an apocalyptic number.

It is an amenable number.

3981785 is a deficient number, since it is larger than the sum of its proper divisors (862255).

3981785 is a wasteful number, since it uses less digits than its factorization.

3981785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10987.

The product of its digits is 60480, while the sum is 41.

The square root of 3981785 is about 1995.4410540028. The cubic root of 3981785 is about 158.4987842689.

The spelling of 3981785 in words is "three million, nine hundred eighty-one thousand, seven hundred eighty-five".