1040540405 has 4 divisors (see below), whose sum is σ = 1248648492. Its totient is φ = 832432320.

The previous prime is 1040540399. The next prime is 1040540411. The reversal of 1040540405 is 5040450401.

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

It is an interprime number because it is at equal distance from previous prime (1040540399) and next prime (1040540411).

It can be written as a sum of positive squares in 2 ways, for example, as 421973764 + 618566641 = 20542^2 + 24871^2 .

It is not a de Polignac number, because 1040540405 - 2⁶ = 1040540341 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, 104054036 + ... + 104054045.

It is an arithmetic number, because the mean of its divisors is an integer number (312162123).

Almost surely, 2^1040540405 is an apocalyptic number.

It is an amenable number.

1040540405 is a deficient number, since it is larger than the sum of its proper divisors (208108087).

1040540405 is an equidigital number, since it uses as much as digits as its factorization.

1040540405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208108086.

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 1040540405 is about 32257.4085288946. The cubic root of 1040540405 is about 1013.3348594617.

Adding to 1040540405 its reverse (5040450401), we get a palindrome (6080990806).

The spelling of 1040540405 in words is "one billion, forty million, five hundred forty thousand, four hundred five".