42342731 has 4 divisors (see below), whose sum is σ = 42779352. Its totient is φ = 41906112.

The previous prime is 42342721. The next prime is 42342749. The reversal of 42342731 is 13724324.

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-42342731 is a prime.

It is a super-2 number, since 2×42342731² = 3585813737076722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42342731.

It is not an unprimeable number, because it can be changed into a prime (42342721) 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, 218165 + ... + 218358.

It is an arithmetic number, because the mean of its divisors is an integer number (10694838).

Almost surely, 2^42342731 is an apocalyptic number.

42342731 is a deficient number, since it is larger than the sum of its proper divisors (436621).

42342731 is an equidigital number, since it uses as much as digits as its factorization.

42342731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 436620.

The product of its digits is 4032, while the sum is 26.

The square root of 42342731 is about 6507.1292441445. The cubic root of 42342731 is about 348.5456138101.

The spelling of 42342731 in words is "forty-two million, three hundred forty-two thousand, seven hundred thirty-one".