42404779 has 4 divisors (see below), whose sum is σ = 42434784. Its totient is φ = 42374776.

The previous prime is 42404767. The next prime is 42404819. The reversal of 42404779 is 97740424.

42404779 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 42404779 - 2²¹ = 40307627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42404729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12772 + ... + 15745.

It is an arithmetic number, because the mean of its divisors is an integer number (10608696).

Almost surely, 2^42404779 is an apocalyptic number.

42404779 is a deficient number, since it is larger than the sum of its proper divisors (30005).

42404779 is a wasteful number, since it uses less digits than its factorization.

42404779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30004.

The product of its (nonzero) digits is 56448, while the sum is 37.

The square root of 42404779 is about 6511.8951926455. The cubic root of 42404779 is about 348.7157807837.

The spelling of 42404779 in words is "forty-two million, four hundred four thousand, seven hundred seventy-nine".