1020403123 has 4 divisors (see below), whose sum is σ = 1020899808. Its totient is φ = 1019906440.

The previous prime is 1020403103. The next prime is 1020403127. The reversal of 1020403123 is 3213040201.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1020403123 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1020403097 and 1020403106.

It is not an unprimeable number, because it can be changed into a prime (1020403127) 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 3 ways as a sum of consecutive naturals, for example, 245248 + ... + 249373.

It is an arithmetic number, because the mean of its divisors is an integer number (255224952).

Almost surely, 2^1020403123 is an apocalyptic number.

1020403123 is a deficient number, since it is larger than the sum of its proper divisors (496685).

1020403123 is an equidigital number, since it uses as much as digits as its factorization.

1020403123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 496684.

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

The square root of 1020403123 is about 31943.7493572686. The cubic root of 1020403123 is about 1006.7553041089.

Adding to 1020403123 its reverse (3213040201), we get a palindrome (4233443324).

The spelling of 1020403123 in words is "one billion, twenty million, four hundred three thousand, one hundred twenty-three".