42018247 has 4 divisors (see below), whose sum is σ = 42037056. Its totient is φ = 41999440.

The previous prime is 42018233. The next prime is 42018257. The reversal of 42018247 is 74281024.

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 42018247 - 2¹¹ = 42016199 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 (42018257) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 5518 + ... + 10699.

It is an arithmetic number, because the mean of its divisors is an integer number (10509264).

Almost surely, 2^42018247 is an apocalyptic number.

42018247 is a deficient number, since it is larger than the sum of its proper divisors (18809).

42018247 is a wasteful number, since it uses less digits than its factorization.

42018247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18808.

The product of its (nonzero) digits is 3584, while the sum is 28.

The square root of 42018247 is about 6482.1483321504. The cubic root of 42018247 is about 347.6529961355.

The spelling of 42018247 in words is "forty-two million, eighteen thousand, two hundred forty-seven".