42777812 has 24 divisors (see below), whose sum is σ = 93334080. Its totient is φ = 16666560.

The previous prime is 42777811. The next prime is 42777821. The reversal of 42777812 is 21877724.

It is a happy number.

42777812 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42777811) 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 7 ways as a sum of consecutive naturals, for example, 69137 + ... + 69752.

It is an arithmetic number, because the mean of its divisors is an integer number (3888920).

Almost surely, 2^42777812 is an apocalyptic number.

It is an amenable number.

42777812 is an abundant number, since it is smaller than the sum of its proper divisors (50556268).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

42777812 is a wasteful number, since it uses less digits than its factorization.

42777812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138911 (or 138909 counting only the distinct ones).

The product of its digits is 43904, while the sum is 38.

The square root of 42777812 is about 6540.4749063046. The cubic root of 42777812 is about 349.7353427835.

The spelling of 42777812 in words is "forty-two million, seven hundred seventy-seven thousand, eight hundred twelve".