42240545 has 16 divisors (see below), whose sum is σ = 52116480. Its totient is φ = 32850624.

The previous prime is 42240533. The next prime is 42240547. The reversal of 42240545 is 54504224.

It is not a de Polignac number, because 42240545 - 2⁶ = 42240481 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (42240547) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40136 + ... + 41174.

It is an arithmetic number, because the mean of its divisors is an integer number (3257280).

Almost surely, 2^42240545 is an apocalyptic number.

It is an amenable number.

42240545 is a deficient number, since it is larger than the sum of its proper divisors (9875935).

42240545 is a wasteful number, since it uses less digits than its factorization.

42240545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1264.

The product of its (nonzero) digits is 6400, while the sum is 26.

The square root of 42240545 is about 6499.2726516126. The cubic root of 42240545 is about 348.2650054594.

Adding to 42240545 its reverse (54504224), we get a palindrome (96744769).

The spelling of 42240545 in words is "forty-two million, two hundred forty thousand, five hundred forty-five".