42878207 has 4 divisors (see below), whose sum is σ = 42898920. Its totient is φ = 42857496.

The previous prime is 42878201. The next prime is 42878261. The reversal of 42878207 is 70287824.

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 42878207 - 2¹⁰ = 42877183 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 (42878201) 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, 6857 + ... + 11522.

It is an arithmetic number, because the mean of its divisors is an integer number (10724730).

Almost surely, 2^42878207 is an apocalyptic number.

42878207 is a deficient number, since it is larger than the sum of its proper divisors (20713).

42878207 is a wasteful number, since it uses less digits than its factorization.

42878207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20712.

The product of its (nonzero) digits is 50176, while the sum is 38.

The square root of 42878207 is about 6548.1453099332. The cubic root of 42878207 is about 350.0087263130.

The spelling of 42878207 in words is "forty-two million, eight hundred seventy-eight thousand, two hundred seven".