42647961 has 4 divisors (see below), whose sum is σ = 56863952. Its totient is φ = 28431972.

The previous prime is 42647947. The next prime is 42647977. The reversal of 42647961 is 16974624.

It is a happy number.

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.

It is not a de Polignac number, because 42647961 - 2⁵ = 42647929 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (42647921) 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, 7107991 + ... + 7107996.

It is an arithmetic number, because the mean of its divisors is an integer number (14215988).

Almost surely, 2^42647961 is an apocalyptic number.

It is an amenable number.

42647961 is a deficient number, since it is larger than the sum of its proper divisors (14215991).

42647961 is a wasteful number, since it uses less digits than its factorization.

42647961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14215990.

The product of its digits is 72576, while the sum is 39.

The square root of 42647961 is about 6530.5406361189. The cubic root of 42647961 is about 349.3811131021.

The spelling of 42647961 in words is "forty-two million, six hundred forty-seven thousand, nine hundred sixty-one".