1042420340 has 48 divisors (see below), whose sum is σ = 2372582352. Its totient is φ = 382427136.

The previous prime is 1042420321. The next prime is 1042420343. The reversal of 1042420340 is 430242401.

It can be written as a sum of positive squares in 8 ways, for example, as 6739216 + 1035681124 = 2596^2 + 32182^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1042420343) 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 15 ways as a sum of consecutive naturals, for example, 28052 + ... + 53588.

It is an arithmetic number, because the mean of its divisors is an integer number (49428799).

Almost surely, 2^1042420340 is an apocalyptic number.

1042420340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1042420340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1186291176).

1042420340 is an abundant number, since it is smaller than the sum of its proper divisors (1330162012).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1042420340 is a wasteful number, since it uses less digits than its factorization.

1042420340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25716 (or 25714 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 1042420340 is about 32286.5349642850. The cubic root of 1042420340 is about 1013.9447533075.

Adding to 1042420340 its reverse (430242401), we get a palindrome (1472662741).

The spelling of 1042420340 in words is "one billion, forty-two million, four hundred twenty thousand, three hundred forty".