120840403 has 4 divisors (see below), whose sum is σ = 127948680. Its totient is φ = 113732128.

The previous prime is 120840389. The next prime is 120840427. The reversal of 120840403 is 304048021.

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 120840403 - 2²⁵ = 87285971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (120840103) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3554113 + ... + 3554146.

It is an arithmetic number, because the mean of its divisors is an integer number (31987170).

Almost surely, 2^120840403 is an apocalyptic number.

120840403 is a deficient number, since it is larger than the sum of its proper divisors (7108277).

120840403 is an equidigital number, since it uses as much as digits as its factorization.

120840403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7108276.

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 120840403 is about 10992.7431972188. The cubic root of 120840403 is about 494.3911883931.

Adding to 120840403 its reverse (304048021), we get a palindrome (424888424).

The spelling of 120840403 in words is "one hundred twenty million, eight hundred forty thousand, four hundred three".