42009743 has 4 divisors (see below), whose sum is σ = 43364928. Its totient is φ = 40654560.

The previous prime is 42009739. The next prime is 42009769. The reversal of 42009743 is 34790024.

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 42009743 - 2² = 42009739 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 (42009713) 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, 677546 + ... + 677607.

It is an arithmetic number, because the mean of its divisors is an integer number (10841232).

Almost surely, 2^42009743 is an apocalyptic number.

42009743 is a deficient number, since it is larger than the sum of its proper divisors (1355185).

42009743 is a wasteful number, since it uses less digits than its factorization.

42009743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1355184.

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 42009743 is about 6481.4923435888. The cubic root of 42009743 is about 347.6295409245.

Adding to 42009743 its reverse (34790024), we get a palindrome (76799767).

The spelling of 42009743 in words is "forty-two million, nine thousand, seven hundred forty-three".