42445215 has 20 divisors (see below), whose sum is σ = 76087704. Its totient is φ = 22637232.

The previous prime is 42445211. The next prime is 42445217. The reversal of 42445215 is 51254424.

42445215 is a `hidden beast` number, since 4 + 2 + 445 + 215 = 666.

It is not a de Polignac number, because 42445215 - 2² = 42445211 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42445211) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 51997 + ... + 52806.

Almost surely, 2^42445215 is an apocalyptic number.

42445215 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

42445215 is a deficient number, since it is larger than the sum of its proper divisors (33642489).

42445215 is a wasteful number, since it uses less digits than its factorization.

42445215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104820 (or 104811 counting only the distinct ones).

The product of its digits is 6400, while the sum is 27.

The square root of 42445215 is about 6514.9992325402. Note that the first 3 decimals coincide. The cubic root of 42445215 is about 348.8265874115.

Adding to 42445215 its reverse (51254424), we get a palindrome (93699639).

The spelling of 42445215 in words is "forty-two million, four hundred forty-five thousand, two hundred fifteen".