42649757 has 2 divisors, whose sum is σ = 42649758. Its totient is φ = 42649756.

The previous prime is 42649729. The next prime is 42649759. The reversal of 42649757 is 75794624.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26481316 + 16168441 = 5146^2 + 4021^2 .

It is a cyclic number.

It is not a de Polignac number, because 42649757 - 2⁸ = 42649501 is a prime.

Together with 42649759, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42649759) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21324878 + 21324879.

It is an arithmetic number, because the mean of its divisors is an integer number (21324879).

Almost surely, 2^42649757 is an apocalyptic number.

It is an amenable number.

42649757 is a deficient number, since it is larger than the sum of its proper divisors (1).

42649757 is an equidigital number, since it uses as much as digits as its factorization.

42649757 is an evil number, because the sum of its binary digits is even.

The product of its digits is 423360, while the sum is 44.

The square root of 42649757 is about 6530.6781424290. The cubic root of 42649757 is about 349.3860174371.

The spelling of 42649757 in words is "forty-two million, six hundred forty-nine thousand, seven hundred fifty-seven".