42506447 has 4 divisors (see below), whose sum is σ = 43203336. Its totient is φ = 41809560.

The previous prime is 42506441. The next prime is 42506449. The reversal of 42506447 is 74460524.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 42506447 - 2⁶ = 42506383 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 (42506441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 348353 + ... + 348474.

It is an arithmetic number, because the mean of its divisors is an integer number (10800834).

Almost surely, 2^42506447 is an apocalyptic number.

42506447 is a deficient number, since it is larger than the sum of its proper divisors (696889).

42506447 is an equidigital number, since it uses as much as digits as its factorization.

42506447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 696888.

The product of its (nonzero) digits is 26880, while the sum is 32.

The square root of 42506447 is about 6519.6968487806. The cubic root of 42506447 is about 348.9942473525.

The spelling of 42506447 in words is "forty-two million, five hundred six thousand, four hundred forty-seven".