3817985 has 4 divisors (see below), whose sum is σ = 4581588. Its totient is φ = 3054384.

The previous prime is 3817981. The next prime is 3817987. The reversal of 3817985 is 5897183.

It is a happy number.

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 734449 + 3083536 = 857^2 + 1756^2 .

It is a cyclic number.

It is not a de Polignac number, because 3817985 - 2² = 3817981 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3817981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 381794 + ... + 381803.

It is an arithmetic number, because the mean of its divisors is an integer number (1145397).

Almost surely, 2^3817985 is an apocalyptic number.

It is an amenable number.

3817985 is a deficient number, since it is larger than the sum of its proper divisors (763603).

3817985 is an equidigital number, since it uses as much as digits as its factorization.

3817985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 763602.

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

The square root of 3817985 is about 1953.9664787299. The cubic root of 3817985 is about 156.2948756436.

The spelling of 3817985 in words is "three million, eight hundred seventeen thousand, nine hundred eighty-five".