1040421205 has 4 divisors (see below), whose sum is σ = 1248505452. Its totient is φ = 832336960.

The previous prime is 1040421203. The next prime is 1040421227. The reversal of 1040421205 is 5021240401.

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 479347236 + 561073969 = 21894^2 + 23687^2 .

It is not a de Polignac number, because 1040421205 - 2¹ = 1040421203 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 (1040421203) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104042116 + ... + 104042125.

It is an arithmetic number, because the mean of its divisors is an integer number (312126363).

Almost surely, 2^1040421205 is an apocalyptic number.

It is an amenable number.

1040421205 is a deficient number, since it is larger than the sum of its proper divisors (208084247).

1040421205 is an equidigital number, since it uses as much as digits as its factorization.

1040421205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208084246.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 1040421205 is about 32255.5608384043. The cubic root of 1040421205 is about 1013.2961635022.

Adding to 1040421205 its reverse (5021240401), we get a palindrome (6061661606).

The spelling of 1040421205 in words is "one billion, forty million, four hundred twenty-one thousand, two hundred five".