3625821 has 6 divisors (see below), whose sum is σ = 5237310. Its totient is φ = 2417208.

The previous prime is 3625813. The next prime is 3625829. The reversal of 3625821 is 1285263.

It is an interprime number because it is at equal distance from previous prime (3625813) and next prime (3625829).

It can be written as a sum of positive squares in only one way, i.e., 2842596 + 783225 = 1686^2 + 885^2 .

It is not a de Polignac number, because 3625821 - 2³ = 3625813 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3625829) 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, 201426 + ... + 201443.

It is an arithmetic number, because the mean of its divisors is an integer number (872885).

Almost surely, 2^3625821 is an apocalyptic number.

It is an amenable number.

3625821 is a deficient number, since it is larger than the sum of its proper divisors (1611489).

3625821 is a wasteful number, since it uses less digits than its factorization.

3625821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402875 (or 402872 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 3625821 is about 1904.1588694224. The cubic root of 3625821 is about 153.6274375221.

The spelling of 3625821 in words is "three million, six hundred twenty-five thousand, eight hundred twenty-one".