42780137 has 4 divisors (see below), whose sum is σ = 42793860. Its totient is φ = 42766416.

The previous prime is 42780131. The next prime is 42780149. The reversal of 42780137 is 73108724.

It is a happy number.

42780137 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, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 6431296 + 36348841 = 2536^2 + 6029^2 .

It is a cyclic number.

It is not a de Polignac number, because 42780137 - 2⁴ = 42780121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42780131) 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, 323 + ... + 9255.

It is an arithmetic number, because the mean of its divisors is an integer number (10698465).

Almost surely, 2^42780137 is an apocalyptic number.

It is an amenable number.

42780137 is a deficient number, since it is larger than the sum of its proper divisors (13723).

42780137 is an equidigital number, since it uses as much as digits as its factorization.

42780137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13722.

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 42780137 is about 6540.6526432765. The cubic root of 42780137 is about 349.7416787779.

The spelling of 42780137 in words is "forty-two million, seven hundred eighty thousand, one hundred thirty-seven".