1000203123 has 16 divisors (see below), whose sum is σ = 1341639936. Its totient is φ = 662796000.

The previous prime is 1000203119. The next prime is 1000203157. The reversal of 1000203123 is 3213020001.

It is a happy number.

It is not a de Polignac number, because 1000203123 - 2² = 1000203119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1000203099 and 1000203108.

It is not an unprimeable number, because it can be changed into a prime (1000203923) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 486165 + ... + 488217.

It is an arithmetic number, because the mean of its divisors is an integer number (83852496).

Almost surely, 2^1000203123 is an apocalyptic number.

1000203123 is a deficient number, since it is larger than the sum of its proper divisors (341436813).

1000203123 is a wasteful number, since it uses less digits than its factorization.

1000203123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2954.

The product of its (nonzero) digits is 36, while the sum is 12.

The square root of 1000203123 is about 31625.9880952359. The cubic root of 1000203123 is about 1000.0677030829.

Adding to 1000203123 its reverse (3213020001), we get a palindrome (4213223124).

The spelling of 1000203123 in words is "one billion, two hundred three thousand, one hundred twenty-three".