42215340 has 72 divisors (see below), whose sum is σ = 124815600. Its totient is φ = 10659456.

The previous prime is 42215339. The next prime is 42215351. The reversal of 42215340 is 4351224.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 20686 + ... + 22634.

It is an arithmetic number, because the mean of its divisors is an integer number (1733550).

Almost surely, 2^42215340 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42215340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (62407800).

42215340 is an abundant number, since it is smaller than the sum of its proper divisors (82600260).

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

42215340 is a wasteful number, since it uses less digits than its factorization.

42215340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1999 (or 1978 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 42215340 is about 6497.3332991313. Note that the first 3 decimals coincide. The cubic root of 42215340 is about 348.1957215838.

Adding to 42215340 its reverse (4351224), we get a palindrome (46566564).

The spelling of 42215340 in words is "forty-two million, two hundred fifteen thousand, three hundred forty".