3818521 has 6 divisors (see below), whose sum is σ = 4442010. Its totient is φ = 3272976.

The previous prime is 3818513. The next prime is 3818527. The reversal of 3818521 is 1258183.

It can be written as a sum of positive squares in only one way, i.e., 3705625 + 112896 = 1925^2 + 336^2 .

It is not a de Polignac number, because 3818521 - 2³ = 3818513 is a prime.

It is a super-2 number, since 2×3818521² = 29162205254882, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3818521.

It is not an unprimeable number, because it can be changed into a prime (3818527) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 38916 + ... + 39013.

It is an arithmetic number, because the mean of its divisors is an integer number (740335).

Almost surely, 2^3818521 is an apocalyptic number.

It is an amenable number.

3818521 is a deficient number, since it is larger than the sum of its proper divisors (623489).

3818521 is an equidigital number, since it uses as much as digits as its factorization.

3818521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77943 (or 77936 counting only the distinct ones).

The product of its digits is 1920, while the sum is 28.

The square root of 3818521 is about 1954.1036308241. The cubic root of 3818521 is about 156.3021892862.

The spelling of 3818521 in words is "three million, eight hundred eighteen thousand, five hundred twenty-one".