3817861 has 4 divisors (see below), whose sum is σ = 3874912. Its totient is φ = 3760812.

The previous prime is 3817859. The next prime is 3817889. The reversal of 3817861 is 1687183.

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 cyclic number.

It is not a de Polignac number, because 3817861 - 2¹ = 3817859 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3817811) 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, 28425 + ... + 28558.

It is an arithmetic number, because the mean of its divisors is an integer number (968728).

Almost surely, 2^3817861 is an apocalyptic number.

It is an amenable number.

3817861 is a deficient number, since it is larger than the sum of its proper divisors (57051).

3817861 is an equidigital number, since it uses as much as digits as its factorization.

3817861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57050.

The product of its digits is 8064, while the sum is 34.

The square root of 3817861 is about 1953.9347481428. The cubic root of 3817861 is about 156.2931835840.

The spelling of 3817861 in words is "three million, eight hundred seventeen thousand, eight hundred sixty-one".