1042320405 has 96 divisors (see below), whose sum is σ = 2068934400. Its totient is φ = 447820800.

The previous prime is 1042320403. The next prime is 1042320427. The reversal of 1042320405 is 5040232401.

It is not a de Polignac number, because 1042320405 - 2¹ = 1042320403 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1042320403) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1486555 + ... + 1487255.

It is an arithmetic number, because the mean of its divisors is an integer number (21551400).

Almost surely, 2^1042320405 is an apocalyptic number.

1042320405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1042320405 is a deficient number, since it is larger than the sum of its proper divisors (1026613995).

1042320405 is an equidigital number, since it uses as much as digits as its factorization.

1042320405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 764 (or 733 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 1042320405 is about 32284.9873006015. The cubic root of 1042320405 is about 1013.9123505735.

Adding to 1042320405 its reverse (5040232401), we get a palindrome (6082552806).

The spelling of 1042320405 in words is "one billion, forty-two million, three hundred twenty thousand, four hundred five".