3641921 has 4 divisors (see below), whose sum is σ = 3645744. Its totient is φ = 3638100.

The previous prime is 3641917. The next prime is 3641923. The reversal of 3641921 is 1291463.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1291463 = 127 ⋅10169.

It is a cyclic number.

It is not a de Polignac number, because 3641921 - 2² = 3641917 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3641923) 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, 806 + ... + 2816.

It is an arithmetic number, because the mean of its divisors is an integer number (911436).

Almost surely, 2^3641921 is an apocalyptic number.

It is an amenable number.

3641921 is a deficient number, since it is larger than the sum of its proper divisors (3823).

3641921 is a wasteful number, since it uses less digits than its factorization.

3641921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3822.

The product of its digits is 1296, while the sum is 26.

The square root of 3641921 is about 1908.3817752221. The cubic root of 3641921 is about 153.8544895291.

The spelling of 3641921 in words is "three million, six hundred forty-one thousand, nine hundred twenty-one".