42215540 has 24 divisors (see below), whose sum is σ = 88814880. Its totient is φ = 16855328.

The previous prime is 42215531. The next prime is 42215581. The reversal of 42215540 is 4551224.

It is a happy number.

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, 11579 + ... + 14781.

It is an arithmetic number, because the mean of its divisors is an integer number (3700620).

Almost surely, 2^42215540 is an apocalyptic number.

It is an amenable number.

42215540 is an abundant number, since it is smaller than the sum of its proper divisors (46599340).

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

42215540 is a wasteful number, since it uses less digits than its factorization.

42215540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3871 (or 3869 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 42215540 is about 6497.3486900427. The cubic root of 42215540 is about 348.1962714553.

Adding to 42215540 its reverse (4551224), we get a palindrome (46766764).

The spelling of 42215540 in words is "forty-two million, two hundred fifteen thousand, five hundred forty".