42140023 has 4 divisors (see below), whose sum is σ = 42419248. Its totient is φ = 41860800.

The previous prime is 42140017. The next prime is 42140029. The reversal of 42140023 is 32004124.

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

It is an interprime number because it is at equal distance from previous prime (42140017) and next prime (42140029).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42140023 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42139979 and 42140006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42140029) 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, 139386 + ... + 139687.

It is an arithmetic number, because the mean of its divisors is an integer number (10604812).

Almost surely, 2^42140023 is an apocalyptic number.

42140023 is a deficient number, since it is larger than the sum of its proper divisors (279225).

42140023 is a wasteful number, since it uses less digits than its factorization.

42140023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279224.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 42140023 is about 6491.5347183852. The cubic root of 42140023 is about 347.9885246359.

Adding to 42140023 its reverse (32004124), we get a palindrome (74144147).

The spelling of 42140023 in words is "forty-two million, one hundred forty thousand, twenty-three".