42822779 has 4 divisors (see below), whose sum is σ = 45341784. Its totient is φ = 40303776.

The previous prime is 42822761. The next prime is 42822799. The reversal of 42822779 is 97722824.

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 42822779 - 2¹² = 42818683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42822739) 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, 1259477 + ... + 1259510.

It is an arithmetic number, because the mean of its divisors is an integer number (11335446).

Almost surely, 2^42822779 is an apocalyptic number.

42822779 is a deficient number, since it is larger than the sum of its proper divisors (2519005).

42822779 is a wasteful number, since it uses less digits than its factorization.

42822779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2519004.

The product of its digits is 112896, while the sum is 41.

The square root of 42822779 is about 6543.9115978137. The cubic root of 42822779 is about 349.8578443108.

The spelling of 42822779 in words is "forty-two million, eight hundred twenty-two thousand, seven hundred seventy-nine".