42945869 has 2 divisors, whose sum is σ = 42945870. Its totient is φ = 42945868.

The previous prime is 42945829. The next prime is 42945883. The reversal of 42945869 is 96854924.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41088100 + 1857769 = 6410^2 + 1363^2 .

It is a cyclic number.

It is not a de Polignac number, because 42945869 - 2¹⁶ = 42880333 is a prime.

It is a super-2 number, since 2×42945869² = 3688695328330322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42945809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21472934 + 21472935.

It is an arithmetic number, because the mean of its divisors is an integer number (21472935).

Almost surely, 2^42945869 is an apocalyptic number.

It is an amenable number.

42945869 is a deficient number, since it is larger than the sum of its proper divisors (1).

42945869 is an equidigital number, since it uses as much as digits as its factorization.

42945869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 622080, while the sum is 47.

The square root of 42945869 is about 6553.3097744575. The cubic root of 42945869 is about 350.1927346636.

The spelling of 42945869 in words is "forty-two million, nine hundred forty-five thousand, eight hundred sixty-nine".