1990103 has 2 divisors, whose sum is σ = 1990104. Its totient is φ = 1990102.

The previous prime is 1990081. The next prime is 1990111. The reversal of 1990103 is 3010991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1990103 - 2⁶ = 1990039 is a prime.

It is equal to p₁₄₈₂₂₆ and since 1990103 and 148226 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1990123) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 995051 + 995052.

It is an arithmetic number, because the mean of its divisors is an integer number (995052).

2^1990103 is an apocalyptic number.

1990103 is a deficient number, since it is larger than the sum of its proper divisors (1).

1990103 is an equidigital number, since it uses as much as digits as its factorization.

1990103 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 243, while the sum is 23.

The square root of 1990103 is about 1410.7101048763. The cubic root of 1990103 is about 125.7839372611.

The spelling of 1990103 in words is "one million, nine hundred ninety thousand, one hundred three".