42856779 has 16 divisors (see below), whose sum is σ = 69147648. Its totient is φ = 23048832.

The previous prime is 42856777. The next prime is 42856819. The reversal of 42856779 is 97765824.

It is not a de Polignac number, because 42856779 - 2¹ = 42856777 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42856777) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59667 + ... + 60380.

It is an arithmetic number, because the mean of its divisors is an integer number (4321728).

Almost surely, 2^42856779 is an apocalyptic number.

42856779 is a deficient number, since it is larger than the sum of its proper divisors (26290869).

42856779 is a wasteful number, since it uses less digits than its factorization.

42856779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120074.

The product of its digits is 846720, while the sum is 48.

The square root of 42856779 is about 6546.5089169725. The cubic root of 42856779 is about 349.9504120223.

The spelling of 42856779 in words is "forty-two million, eight hundred fifty-six thousand, seven hundred seventy-nine".