42406657 has 2 divisors, whose sum is σ = 42406658. Its totient is φ = 42406656.

The previous prime is 42406627. The next prime is 42406709. The reversal of 42406657 is 75660424.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32821441 + 9585216 = 5729^2 + 3096^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42406657 is a prime.

It is not a weakly prime, because it can be changed into another prime (42406627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21203328 + 21203329.

It is an arithmetic number, because the mean of its divisors is an integer number (21203329).

Almost surely, 2^42406657 is an apocalyptic number.

It is an amenable number.

42406657 is a deficient number, since it is larger than the sum of its proper divisors (1).

42406657 is an equidigital number, since it uses as much as digits as its factorization.

42406657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40320, while the sum is 34.

The square root of 42406657 is about 6512.0393887015. The cubic root of 42406657 is about 348.7209286199.

The spelling of 42406657 in words is "forty-two million, four hundred six thousand, six hundred fifty-seven".