4125821 has 8 divisors (see below), whose sum is σ = 4867584. Its totient is φ = 3422160.

The previous prime is 4125787. The next prime is 4125827. The reversal of 4125821 is 1285214.

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

It is not a de Polignac number, because 4125821 - 2¹⁸ = 3863677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4125827) 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, 9290 + ... + 9723.

It is an arithmetic number, because the mean of its divisors is an integer number (608448).

Almost surely, 2^4125821 is an apocalyptic number.

It is an amenable number.

4125821 is a deficient number, since it is larger than the sum of its proper divisors (741763).

4125821 is a wasteful number, since it uses less digits than its factorization.

4125821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19051.

The product of its digits is 640, while the sum is 23.

The square root of 4125821 is about 2031.2117073314. The cubic root of 4125821 is about 160.3873557361.

The spelling of 4125821 in words is "four million, one hundred twenty-five thousand, eight hundred twenty-one".