42090642 has 24 divisors (see below), whose sum is σ = 99487440. Its totient is φ = 12754680.

The previous prime is 42090613. The next prime is 42090649. The reversal of 42090642 is 24609024.

It is not an unprimeable number, because it can be changed into a prime (42090649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 106092 + ... + 106487.

It is an arithmetic number, because the mean of its divisors is an integer number (4145310).

Almost surely, 2^42090642 is an apocalyptic number.

42090642 is an abundant number, since it is smaller than the sum of its proper divisors (57396798).

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

42090642 is a wasteful number, since it uses less digits than its factorization.

42090642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212598 (or 212595 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 42090642 is about 6487.7301115259. The cubic root of 42090642 is about 347.8525435524.

Adding to 42090642 its reverse (24609024), we get a palindrome (66699666).

The spelling of 42090642 in words is "forty-two million, ninety thousand, six hundred forty-two".