42403943 has 4 divisors (see below), whose sum is σ = 42793080. Its totient is φ = 42014808.

The previous prime is 42403937. The next prime is 42403951. The reversal of 42403943 is 34930424.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42403943 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42403343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 194405 + ... + 194622.

It is an arithmetic number, because the mean of its divisors is an integer number (10698270).

Almost surely, 2^42403943 is an apocalyptic number.

42403943 is a deficient number, since it is larger than the sum of its proper divisors (389137).

42403943 is a wasteful number, since it uses less digits than its factorization.

42403943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 389136.

The product of its (nonzero) digits is 10368, while the sum is 29.

The square root of 42403943 is about 6511.8310021069. The cubic root of 42403943 is about 348.7134891528.

The spelling of 42403943 in words is "forty-two million, four hundred three thousand, nine hundred forty-three".