42550979 has 4 divisors (see below), whose sum is σ = 42564984. Its totient is φ = 42536976.

The previous prime is 42550957. The next prime is 42550993. The reversal of 42550979 is 97905524.

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 is a cyclic number.

It is not a de Polignac number, because 42550979 - 2⁸ = 42550723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42550919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 317 + ... + 9230.

It is an arithmetic number, because the mean of its divisors is an integer number (10641246).

Almost surely, 2^42550979 is an apocalyptic number.

42550979 is a deficient number, since it is larger than the sum of its proper divisors (14005).

42550979 is an equidigital number, since it uses as much as digits as its factorization.

42550979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14004.

The product of its (nonzero) digits is 113400, while the sum is 41.

The square root of 42550979 is about 6523.1111442317. Note that the first 4 decimals coincide. The cubic root of 42550979 is about 349.1160797547.

The spelling of 42550979 in words is "forty-two million, five hundred fifty thousand, nine hundred seventy-nine".