42009812 has 24 divisors (see below), whose sum is σ = 79380000. Its totient is φ = 19338336.

The previous prime is 42009809. The next prime is 42009823. The reversal of 42009812 is 21890024.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25139 + ... + 26757.

It is an arithmetic number, because the mean of its divisors is an integer number (3307500).

Almost surely, 2^42009812 is an apocalyptic number.

It is an amenable number.

42009812 is a deficient number, since it is larger than the sum of its proper divisors (37370188).

42009812 is a wasteful number, since it uses less digits than its factorization.

42009812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2135 (or 2133 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 42009812 is about 6481.4976664348. The cubic root of 42009812 is about 347.6297312488.

Adding to 42009812 its reverse (21890024), we get a palindrome (63899836).

The spelling of 42009812 in words is "forty-two million, nine thousand, eight hundred twelve".