42042031 has 8 divisors (see below), whose sum is σ = 43116080. Its totient is φ = 40981248.

The previous prime is 42042023. The next prime is 42042053. The reversal of 42042031 is 13024024.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 42042031 - 2³ = 42042023 is a prime.

It is a super-2 number, since 2×42042031² = 3535064741209922, 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 = 42041996 and 42042014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42042061) 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 7 ways as a sum of consecutive naturals, for example, 3265 + ... + 9733.

It is an arithmetic number, because the mean of its divisors is an integer number (5389510).

Almost surely, 2^42042031 is an apocalyptic number.

42042031 is a deficient number, since it is larger than the sum of its proper divisors (1074049).

42042031 is an equidigital number, since it uses as much as digits as its factorization.

42042031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6633.

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

The square root of 42042031 is about 6483.9826495758. The cubic root of 42042031 is about 347.7185789067.

Adding to 42042031 its reverse (13024024), we get a palindrome (55066055).

The spelling of 42042031 in words is "forty-two million, forty-two thousand, thirty-one".