4020403 has 4 divisors (see below), whose sum is σ = 4029480. Its totient is φ = 4011328.

The previous prime is 4020361. The next prime is 4020407. The reversal of 4020403 is 3040204.

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

It is a cyclic number.

It is not a de Polignac number, because 4020403 - 2¹⁷ = 3889331 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4020407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3838 + ... + 4771.

It is an arithmetic number, because the mean of its divisors is an integer number (1007370).

Almost surely, 2^4020403 is an apocalyptic number.

4020403 is a deficient number, since it is larger than the sum of its proper divisors (9077).

4020403 is an equidigital number, since it uses as much as digits as its factorization.

4020403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9076.

The product of its (nonzero) digits is 96, while the sum is 13.

The square root of 4020403 is about 2005.0942621234. The cubic root of 4020403 is about 159.0095454628.

Adding to 4020403 its reverse (3040204), we get a palindrome (7060607).

The spelling of 4020403 in words is "four million, twenty thousand, four hundred three".