42918247 has 4 divisors (see below), whose sum is σ = 43055680. Its totient is φ = 42780816.

The previous prime is 42918199. The next prime is 42918263. The reversal of 42918247 is 74281924.

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 42918247 - 2¹¹ = 42916199 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 (42918647) 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, 68247 + ... + 68872.

It is an arithmetic number, because the mean of its divisors is an integer number (10763920).

Almost surely, 2^42918247 is an apocalyptic number.

42918247 is a deficient number, since it is larger than the sum of its proper divisors (137433).

42918247 is a wasteful number, since it uses less digits than its factorization.

42918247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137432.

The product of its digits is 32256, while the sum is 37.

The square root of 42918247 is about 6551.2019507874. The cubic root of 42918247 is about 350.1176393671.

The spelling of 42918247 in words is "forty-two million, nine hundred eighteen thousand, two hundred forty-seven".