42120642 has 8 divisors (see below), whose sum is σ = 84241296. Its totient is φ = 14040212.

The previous prime is 42120623. The next prime is 42120647. The reversal of 42120642 is 24602124.

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

42120642 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (42120647) 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, 3510048 + ... + 3510059.

It is an arithmetic number, because the mean of its divisors is an integer number (10530162).

Almost surely, 2^42120642 is an apocalyptic number.

42120642 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

42120642 is a wasteful number, since it uses less digits than its factorization.

42120642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7020112.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 42120642 is about 6490.0417564142. The cubic root of 42120642 is about 347.9351676027.

Adding to 42120642 its reverse (24602124), we get a palindrome (66722766).

The spelling of 42120642 in words is "forty-two million, one hundred twenty thousand, six hundred forty-two".