42455815 has 8 divisors (see below), whose sum is σ = 53162208. Its totient is φ = 32487840.

The previous prime is 42455813. The next prime is 42455821. The reversal of 42455815 is 51855424.

It is a happy number.

42455815 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 42455815 - 2¹ = 42455813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42455813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 184476 + ... + 184705.

It is an arithmetic number, because the mean of its divisors is an integer number (6645276).

Almost surely, 2^42455815 is an apocalyptic number.

42455815 is a deficient number, since it is larger than the sum of its proper divisors (10706393).

42455815 is a wasteful number, since it uses less digits than its factorization.

42455815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 369209.

The product of its digits is 32000, while the sum is 34.

The square root of 42455815 is about 6515.8126891432. The cubic root of 42455815 is about 348.8556229110.

The spelling of 42455815 in words is "forty-two million, four hundred fifty-five thousand, eight hundred fifteen".