1920403 has 2 divisors, whose sum is σ = 1920404. Its totient is φ = 1920402.

The previous prime is 1920397. The next prime is 1920407. The reversal of 1920403 is 3040291.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1920403 - 2⁹ = 1919891 is a prime.

It is an Ulam number.

It is equal to p₁₄₃₄₄₃ and since 1920403 and 143443 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (1920407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 960201 + 960202.

It is an arithmetic number, because the mean of its divisors is an integer number (960202).

2^1920403 is an apocalyptic number.

1920403 is a deficient number, since it is larger than the sum of its proper divisors (1).

1920403 is an equidigital number, since it uses as much as digits as its factorization.

1920403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 1920403 is about 1385.7860585242. The cubic root of 1920403 is about 124.2979955652.

Adding to 1920403 its reverse (3040291), we get a palindrome (4960694).

The spelling of 1920403 in words is "one million, nine hundred twenty thousand, four hundred three".