42817779 has 6 divisors (see below), whose sum is σ = 61847916. Its totient is φ = 28545180.

The previous prime is 42817751. The next prime is 42817783. The reversal of 42817779 is 97771824.

It is a happy number.

It is not a de Polignac number, because 42817779 - 2⁹ = 42817267 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42817739) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2378757 + ... + 2378774.

It is an arithmetic number, because the mean of its divisors is an integer number (10307986).

Almost surely, 2^42817779 is an apocalyptic number.

42817779 is a deficient number, since it is larger than the sum of its proper divisors (19030137).

42817779 is a wasteful number, since it uses less digits than its factorization.

42817779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4757537 (or 4757534 counting only the distinct ones).

The product of its digits is 197568, while the sum is 45.

The square root of 42817779 is about 6543.5295521607. The cubic root of 42817779 is about 349.8442272800.

The spelling of 42817779 in words is "forty-two million, eight hundred seventeen thousand, seven hundred seventy-nine".