42666947 has 2 divisors, whose sum is σ = 42666948. Its totient is φ = 42666946.

The previous prime is 42666931. The next prime is 42666983. The reversal of 42666947 is 74966624.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42666947 - 2⁴ = 42666931 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42666898 and 42666907.

It is not a weakly prime, because it can be changed into another prime (42666907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21333473 + 21333474.

It is an arithmetic number, because the mean of its divisors is an integer number (21333474).

Almost surely, 2^42666947 is an apocalyptic number.

42666947 is a deficient number, since it is larger than the sum of its proper divisors (1).

42666947 is an equidigital number, since it uses as much as digits as its factorization.

42666947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 435456, while the sum is 44.

The square root of 42666947 is about 6531.9941059373. The cubic root of 42666947 is about 349.4329511857.

The spelling of 42666947 in words is "forty-two million, six hundred sixty-six thousand, nine hundred forty-seven".