3643925 has 6 divisors (see below), whose sum is σ = 4518498. Its totient is φ = 2915120.

The previous prime is 3643921. The next prime is 3643951. The reversal of 3643925 is 5293463.

It can be written as a sum of positive squares in 3 ways, for example, as 908209 + 2735716 = 953^2 + 1654^2 .

It is not a de Polignac number, because 3643925 - 2² = 3643921 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 3643891 and 3643900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3643921) 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, 72854 + ... + 72903.

It is an arithmetic number, because the mean of its divisors is an integer number (753083).

Almost surely, 2^3643925 is an apocalyptic number.

It is an amenable number.

3643925 is a deficient number, since it is larger than the sum of its proper divisors (874573).

3643925 is a wasteful number, since it uses less digits than its factorization.

3643925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145767 (or 145762 counting only the distinct ones).

The product of its digits is 19440, while the sum is 32.

The square root of 3643925 is about 1908.9067551874. The cubic root of 3643925 is about 153.8827042965.

The spelling of 3643925 in words is "three million, six hundred forty-three thousand, nine hundred twenty-five".