4191621 has 8 divisors (see below), whose sum is σ = 6387264. Its totient is φ = 2395200.

The previous prime is 4191613. The next prime is 4191623. The reversal of 4191621 is 1261914.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 4191621 - 2³ = 4191613 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 4191591 and 4191600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4191623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 99780 + ... + 99821.

It is an arithmetic number, because the mean of its divisors is an integer number (798408).

Almost surely, 2^4191621 is an apocalyptic number.

It is an amenable number.

4191621 is a deficient number, since it is larger than the sum of its proper divisors (2195643).

4191621 is a wasteful number, since it uses less digits than its factorization.

4191621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199611.

The product of its digits is 432, while the sum is 24.

The square root of 4191621 is about 2047.3448659178. The cubic root of 4191621 is about 161.2355001685.

The spelling of 4191621 in words is "four million, one hundred ninety-one thousand, six hundred twenty-one".