42384821 has 4 divisors (see below), whose sum is σ = 42418944. Its totient is φ = 42350700.

The previous prime is 42384743. The next prime is 42384841. The reversal of 42384821 is 12848324.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42384821 - 2¹⁰ = 42383797 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 (42384841) 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, 15125 + ... + 17706.

It is an arithmetic number, because the mean of its divisors is an integer number (10604736).

Almost surely, 2^42384821 is an apocalyptic number.

It is an amenable number.

42384821 is a deficient number, since it is larger than the sum of its proper divisors (34123).

42384821 is a wasteful number, since it uses less digits than its factorization.

42384821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34122.

The product of its digits is 12288, while the sum is 32.

The square root of 42384821 is about 6510.3625859087. The cubic root of 42384821 is about 348.6610639816.

The spelling of 42384821 in words is "forty-two million, three hundred eighty-four thousand, eight hundred twenty-one".