1040540421 has 8 divisors (see below), whose sum is σ = 1387712320. Its totient is φ = 693531072.

The previous prime is 1040540411. The next prime is 1040540477. The reversal of 1040540421 is 1240450401.

It is a happy number.

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

It is not a de Polignac number, because 1040540421 - 2²¹ = 1038443269 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1040540411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24820 + ... + 51933.

It is an arithmetic number, because the mean of its divisors is an integer number (173464040).

Almost surely, 2^1040540421 is an apocalyptic number.

It is an amenable number.

1040540421 is a deficient number, since it is larger than the sum of its proper divisors (347171899).

1040540421 is an equidigital number, since it uses as much as digits as its factorization.

1040540421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81275.

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 1040540421 is about 32257.4087768996. The cubic root of 1040540421 is about 1013.3348646556.

Adding to 1040540421 its reverse (1240450401), we get a palindrome (2280990822).

The spelling of 1040540421 in words is "one billion, forty million, five hundred forty thousand, four hundred twenty-one".