42343993 has 4 divisors (see below), whose sum is σ = 42732580. Its totient is φ = 41955408.

The previous prime is 42343981. The next prime is 42343997. The reversal of 42343993 is 39934324.

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

It can be written as a sum of positive squares in 2 ways, for example, as 23785129 + 18558864 = 4877^2 + 4308^2 .

It is a de Polignac number, because none of the positive numbers 2^k-42343993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42343997) 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, 194130 + ... + 194347.

It is an arithmetic number, because the mean of its divisors is an integer number (10683145).

Almost surely, 2^42343993 is an apocalyptic number.

It is an amenable number.

42343993 is a deficient number, since it is larger than the sum of its proper divisors (388587).

42343993 is a wasteful number, since it uses less digits than its factorization.

42343993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388586.

The product of its digits is 69984, while the sum is 37.

The square root of 42343993 is about 6507.2262139870. The cubic root of 42343993 is about 348.5490765075.

It can be divided in two parts, 42 and 343993, that added together give a triangular number (344035 = T₈₂₉).

The spelling of 42343993 in words is "forty-two million, three hundred forty-three thousand, nine hundred ninety-three".