42420434 has 8 divisors (see below), whose sum is σ = 72720768. Its totient is φ = 18180180.

The previous prime is 42420419. The next prime is 42420439. The reversal of 42420434 is 43402424.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (42420439) 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, 1515002 + ... + 1515029.

It is an arithmetic number, because the mean of its divisors is an integer number (9090096).

Almost surely, 2^42420434 is an apocalyptic number.

42420434 is a deficient number, since it is larger than the sum of its proper divisors (30300334).

42420434 is a wasteful number, since it uses less digits than its factorization.

42420434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3030040.

The product of its (nonzero) digits is 3072, while the sum is 23.

The square root of 42420434 is about 6513.0971127414. The cubic root of 42420434 is about 348.7586884780.

Adding to 42420434 its reverse (43402424), we get a palindrome (85822858).

The spelling of 42420434 in words is "forty-two million, four hundred twenty thousand, four hundred thirty-four".