4193921 has 4 divisors (see below), whose sum is σ = 4227072. Its totient is φ = 4160772.

The previous prime is 4193909. The next prime is 4193929. The reversal of 4193921 is 1293914.

It is a happy number.

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 an emirpimes, since its reverse is a distinct semiprime: 1293914 = 2 ⋅646957.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4193921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4193929) 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, 16385 + ... + 16638.

It is an arithmetic number, because the mean of its divisors is an integer number (1056768).

Almost surely, 2^4193921 is an apocalyptic number.

It is an amenable number.

4193921 is a deficient number, since it is larger than the sum of its proper divisors (33151).

4193921 is a wasteful number, since it uses less digits than its factorization.

4193921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33150.

The product of its digits is 1944, while the sum is 29.

The square root of 4193921 is about 2047.9064920059. The cubic root of 4193921 is about 161.2649854871.

The spelling of 4193921 in words is "four million, one hundred ninety-three thousand, nine hundred twenty-one".