42786641 has 2 divisors, whose sum is σ = 42786642. Its totient is φ = 42786640.

The previous prime is 42786631. The next prime is 42786643. The reversal of 42786641 is 14668724.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35058241 + 7728400 = 5921^2 + 2780^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42786641 is a prime.

Together with 42786643, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 42786595 and 42786604.

It is not a weakly prime, because it can be changed into another prime (42786643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21393320 + 21393321.

It is an arithmetic number, because the mean of its divisors is an integer number (21393321).

Almost surely, 2^42786641 is an apocalyptic number.

It is an amenable number.

42786641 is a deficient number, since it is larger than the sum of its proper divisors (1).

42786641 is an equidigital number, since it uses as much as digits as its factorization.

42786641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64512, while the sum is 38.

The square root of 42786641 is about 6541.1498224701. The cubic root of 42786641 is about 349.7594019923.

The spelling of 42786641 in words is "forty-two million, seven hundred eighty-six thousand, six hundred forty-one".