3653891 has 4 divisors (see below), whose sum is σ = 3658512. Its totient is φ = 3649272.

The previous prime is 3653863. The next prime is 3653911. The reversal of 3653891 is 1983563.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3653891 is a prime.

It is a d-powerful number, because it can be written as 3¹⁰ + 6⁶ + 5⁹ + 3¹³ + 8 + 9³ + 1 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3653821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 791 + ... + 2816.

It is an arithmetic number, because the mean of its divisors is an integer number (914628).

Almost surely, 2^3653891 is an apocalyptic number.

3653891 is a deficient number, since it is larger than the sum of its proper divisors (4621).

3653891 is a wasteful number, since it uses less digits than its factorization.

3653891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4620.

The product of its digits is 19440, while the sum is 35.

The square root of 3653891 is about 1911.5153674507. The cubic root of 3653891 is about 154.0228644300.

The spelling of 3653891 in words is "three million, six hundred fifty-three thousand, eight hundred ninety-one".