42879247 has 4 divisors (see below), whose sum is σ = 43303896. Its totient is φ = 42454600.

The previous prime is 42879233. The next prime is 42879281. The reversal of 42879247 is 74297824.

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 42879247 - 2¹¹ = 42877199 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 (42879227) 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, 212173 + ... + 212374.

It is an arithmetic number, because the mean of its divisors is an integer number (10825974).

Almost surely, 2^42879247 is an apocalyptic number.

42879247 is a deficient number, since it is larger than the sum of its proper divisors (424649).

42879247 is a wasteful number, since it uses less digits than its factorization.

42879247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424648.

The product of its digits is 225792, while the sum is 43.

The square root of 42879247 is about 6548.2247212508. The cubic root of 42879247 is about 350.0115560810.

The spelling of 42879247 in words is "forty-two million, eight hundred seventy-nine thousand, two hundred forty-seven".