40123205 has 4 divisors (see below), whose sum is σ = 48147852. Its totient is φ = 32098560.

The previous prime is 40123199. The next prime is 40123217. The reversal of 40123205 is 50232104.

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 26388769 + 13734436 = 5137^2 + 3706^2 .

It is not a de Polignac number, because 40123205 - 2⁴ = 40123189 is a prime.

It is a Duffinian number.

It is a congruent 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, 4012316 + ... + 4012325.

It is an arithmetic number, because the mean of its divisors is an integer number (12036963).

Almost surely, 2^40123205 is an apocalyptic number.

It is an amenable number.

40123205 is a deficient number, since it is larger than the sum of its proper divisors (8024647).

40123205 is an equidigital number, since it uses as much as digits as its factorization.

40123205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8024646.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 40123205 is about 6334.2880420770. The cubic root of 40123205 is about 342.3459587544.

Adding to 40123205 its reverse (50232104), we get a palindrome (90355309).

The spelling of 40123205 in words is "forty million, one hundred twenty-three thousand, two hundred five".