3898805 has 4 divisors (see below), whose sum is σ = 4678572. Its totient is φ = 3119040.

The previous prime is 3898771. The next prime is 3898841. The reversal of 3898805 is 5088983.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5088983 = 1097 ⋅4639.

It can be written as a sum of positive squares in 2 ways, for example, as 2896804 + 1002001 = 1702^2 + 1001^2 .

It is not a de Polignac number, because 3898805 - 2⁸ = 3898549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 389876 + ... + 389885.

It is an arithmetic number, because the mean of its divisors is an integer number (1169643).

Almost surely, 2^3898805 is an apocalyptic number.

It is an amenable number.

3898805 is a deficient number, since it is larger than the sum of its proper divisors (779767).

3898805 is an equidigital number, since it uses as much as digits as its factorization.

3898805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 779766.

The product of its (nonzero) digits is 69120, while the sum is 41.

The square root of 3898805 is about 1974.5391867471. The cubic root of 3898805 is about 157.3900130738.

The spelling of 3898805 in words is "three million, eight hundred ninety-eight thousand, eight hundred five".