42340031 has 4 divisors (see below), whose sum is σ = 42377064. Its totient is φ = 42303000.

The previous prime is 42340027. The next prime is 42340049. The reversal of 42340031 is 13004324.

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 42340031 - 2² = 42340027 is a prime.

It is a super-2 number, since 2×42340031² = 3585356450161922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42339991 and 42340009.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42345031) 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, 16745 + ... + 19106.

It is an arithmetic number, because the mean of its divisors is an integer number (10594266).

Almost surely, 2^42340031 is an apocalyptic number.

42340031 is a deficient number, since it is larger than the sum of its proper divisors (37033).

42340031 is a wasteful number, since it uses less digits than its factorization.

42340031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37032.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 42340031 is about 6506.9217760781. The cubic root of 42340031 is about 348.5382052724.

Adding to 42340031 its reverse (13004324), we get a palindrome (55344355).

The spelling of 42340031 in words is "forty-two million, three hundred forty thousand, thirty-one".