42645947 has 2 divisors, whose sum is σ = 42645948. Its totient is φ = 42645946.

The previous prime is 42645931. The next prime is 42645959. The reversal of 42645947 is 74954624.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42645947 - 2⁴ = 42645931 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42645917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21322973 + 21322974.

It is an arithmetic number, because the mean of its divisors is an integer number (21322974).

Almost surely, 2^42645947 is an apocalyptic number.

42645947 is a deficient number, since it is larger than the sum of its proper divisors (1).

42645947 is an equidigital number, since it uses as much as digits as its factorization.

42645947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 241920, while the sum is 41.

The square root of 42645947 is about 6530.3864357326. The cubic root of 42645947 is about 349.3756133109.

The spelling of 42645947 in words is "forty-two million, six hundred forty-five thousand, nine hundred forty-seven".