42779247 has 16 divisors (see below), whose sum is σ = 65436672. Its totient is φ = 24351840.

The previous prime is 42779227. The next prime is 42779249. The reversal of 42779247 is 74297724.

42779247 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 42779247 - 2¹¹ = 42777199 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42779199 and 42779208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42779249) 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 15 ways as a sum of consecutive naturals, for example, 1933 + ... + 9449.

It is an arithmetic number, because the mean of its divisors is an integer number (4089792).

Almost surely, 2^42779247 is an apocalyptic number.

42779247 is a deficient number, since it is larger than the sum of its proper divisors (22657425).

42779247 is a wasteful number, since it uses less digits than its factorization.

42779247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7798.

The product of its digits is 197568, while the sum is 42.

The square root of 42779247 is about 6540.5846068987. The cubic root of 42779247 is about 349.7392534136.

The spelling of 42779247 in words is "forty-two million, seven hundred seventy-nine thousand, two hundred forty-seven".