42242861 has 4 divisors (see below), whose sum is σ = 42256032. Its totient is φ = 42229692.

The previous prime is 42242831. The next prime is 42242869. The reversal of 42242861 is 16824224.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42242861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42242869) 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, 1706 + ... + 9348.

It is an arithmetic number, because the mean of its divisors is an integer number (10564008).

Almost surely, 2^42242861 is an apocalyptic number.

It is an amenable number.

42242861 is a deficient number, since it is larger than the sum of its proper divisors (13171).

42242861 is an equidigital number, since it uses as much as digits as its factorization.

42242861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13170.

The product of its digits is 6144, while the sum is 29.

The square root of 42242861 is about 6499.4508229542. The cubic root of 42242861 is about 348.2713703316.

The spelling of 42242861 in words is "forty-two million, two hundred forty-two thousand, eight hundred sixty-one".