42394645 has 4 divisors (see below), whose sum is σ = 50873580. Its totient is φ = 33915712.

The previous prime is 42394633. The next prime is 42394661. The reversal of 42394645 is 54649324.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7431076 + 34963569 = 2726^2 + 5913^2 .

It is a cyclic number.

It is not a de Polignac number, because 42394645 - 2¹³ = 42386453 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4239460 + ... + 4239469.

It is an arithmetic number, because the mean of its divisors is an integer number (12718395).

Almost surely, 2^42394645 is an apocalyptic number.

It is an amenable number.

42394645 is a deficient number, since it is larger than the sum of its proper divisors (8478935).

42394645 is an equidigital number, since it uses as much as digits as its factorization.

42394645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8478934.

The product of its digits is 103680, while the sum is 37.

The square root of 42394645 is about 6511.1170316621. The cubic root of 42394645 is about 348.6879995811.

The spelling of 42394645 in words is "forty-two million, three hundred ninety-four thousand, six hundred forty-five".