3845521 has 9 divisors (see below), whose sum is σ = 4028241. Its totient is φ = 3670992.

The previous prime is 3845497. The next prime is 3845537. The reversal of 3845521 is 1255483.

The square root of 3845521 is 1961.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 1535121 + 2310400 = 1239^2 + 1520^2 .

It is not a de Polignac number, because 3845521 - 2⁵ = 3845489 is a prime.

It is a super-2 number, since 2×3845521² = 29576063522882, which contains 22 as substring.

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 3845521.

It is not an unprimeable number, because it can be changed into a prime (3845221) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 72531 + ... + 72583.

Almost surely, 2^3845521 is an apocalyptic number.

3845521 is the 1961-st square number.

3845521 is the 981-st centered octagonal number.

It is an amenable number.

3845521 is a deficient number, since it is larger than the sum of its proper divisors (182720).

3845521 is an frugal number, since it uses more digits than its factorization.

3845521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180 (or 90 counting only the distinct ones).

The product of its digits is 4800, while the sum is 28.

The cubic root of 3845521 is about 156.6697182646.

The spelling of 3845521 in words is "three million, eight hundred forty-five thousand, five hundred twenty-one".