3653861 has 12 divisors (see below), whose sum is σ = 4001508. Its totient is φ = 3324672.

The previous prime is 3653851. The next prime is 3653863. The reversal of 3653861 is 1683563.

It can be written as a sum of positive squares in 6 ways, for example, as 828100 + 2825761 = 910^2 + 1681^2 .

It is a de Polignac number, because none of the positive numbers 2^k-3653861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3653863) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23195 + ... + 23351.

It is an arithmetic number, because the mean of its divisors is an integer number (333459).

Almost surely, 2^3653861 is an apocalyptic number.

It is an amenable number.

3653861 is a deficient number, since it is larger than the sum of its proper divisors (347647).

3653861 is a wasteful number, since it uses less digits than its factorization.

3653861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248 (or 211 counting only the distinct ones).

The product of its digits is 12960, while the sum is 32.

The square root of 3653861 is about 1911.5075202572. The cubic root of 3653861 is about 154.0224428977.

The spelling of 3653861 in words is "three million, six hundred fifty-three thousand, eight hundred sixty-one".