42403309 has 8 divisors (see below), whose sum is σ = 45947552. Its totient is φ = 38899440.

The previous prime is 42403297. The next prime is 42403313. The reversal of 42403309 is 90330424.

42403309 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 42403309 - 2⁹ = 42402797 is a prime.

It is a super-2 number, since 2×42403309² = 3596081228298962, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42403379) 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 7 ways as a sum of consecutive naturals, for example, 7887 + ... + 12124.

It is an arithmetic number, because the mean of its divisors is an integer number (5743444).

Almost surely, 2^42403309 is an apocalyptic number.

It is an amenable number.

42403309 is a deficient number, since it is larger than the sum of its proper divisors (3544243).

42403309 is a wasteful number, since it uses less digits than its factorization.

42403309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20187.

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 42403309 is about 6511.7823213004. The cubic root of 42403309 is about 348.7117512212.

The spelling of 42403309 in words is "forty-two million, four hundred three thousand, three hundred nine".