4200905 has 4 divisors (see below), whose sum is σ = 5041092. Its totient is φ = 3360720.

The previous prime is 4200883. The next prime is 4200923. The reversal of 4200905 is 5090024.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 913936 + 3286969 = 956^2 + 1813^2 .

It is not a de Polignac number, because 4200905 - 2¹² = 4196809 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 420086 + ... + 420095.

It is an arithmetic number, because the mean of its divisors is an integer number (1260273).

Almost surely, 2^4200905 is an apocalyptic number.

It is an amenable number.

4200905 is a deficient number, since it is larger than the sum of its proper divisors (840187).

4200905 is an equidigital number, since it uses as much as digits as its factorization.

4200905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 840186.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 4200905 is about 2049.6109386906. The cubic root of 4200905 is about 161.3544522855.

Adding to 4200905 its reverse (5090024), we get a palindrome (9290929).

The spelling of 4200905 in words is "four million, two hundred thousand, nine hundred five".