4121805 has 8 divisors (see below), whose sum is σ = 6594912. Its totient is φ = 2198288.

The previous prime is 4121797. The next prime is 4121809. The reversal of 4121805 is 5081214.

4121805 = 470² + 471² + ... + 487².

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

It is a cyclic number.

It is not a de Polignac number, because 4121805 - 2³ = 4121797 is a prime.

It is a Curzon number.

4121805 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4121809) 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, 137379 + ... + 137408.

It is an arithmetic number, because the mean of its divisors is an integer number (824364).

Almost surely, 2^4121805 is an apocalyptic number.

It is an amenable number.

4121805 is a deficient number, since it is larger than the sum of its proper divisors (2473107).

4121805 is a wasteful number, since it uses less digits than its factorization.

4121805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274795.

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 4121805 is about 2030.2228941670. Note that the first 3 decimals coincide. The cubic root of 4121805 is about 160.3352994526.

The spelling of 4121805 in words is "four million, one hundred twenty-one thousand, eight hundred five".