1020340123 has 12 divisors (see below), whose sum is σ = 1132026840. Its totient is φ = 918901280.

The previous prime is 1020340121. The next prime is 1020340133. The reversal of 1020340123 is 3210430201.

It is a happy number.

It is not a de Polignac number, because 1020340123 - 2¹ = 1020340121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1020340097 and 1020340106.

It is not an unprimeable number, because it can be changed into a prime (1020340121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26458 + ... + 52351.

It is an arithmetic number, because the mean of its divisors is an integer number (94335570).

Almost surely, 2^1020340123 is an apocalyptic number.

1020340123 is a deficient number, since it is larger than the sum of its proper divisors (111686717).

1020340123 is a wasteful number, since it uses less digits than its factorization.

1020340123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78938 (or 78927 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 1020340123 is about 31942.7632336340. The cubic root of 1020340123 is about 1006.7345845560.

Adding to 1020340123 its reverse (3210430201), we get a palindrome (4230770324).

It can be divided in two parts, 1020 and 340123, that added together give a palindrome (341143).

The spelling of 1020340123 in words is "one billion, twenty million, three hundred forty thousand, one hundred twenty-three".