42240289 has 16 divisors (see below), whose sum is σ = 52189312. Its totient is φ = 33291648.

The previous prime is 42240271. The next prime is 42240307. The reversal of 42240289 is 98204224.

It is an interprime number because it is at equal distance from previous prime (42240271) and next prime (42240307).

It is not a de Polignac number, because 42240289 - 2⁷ = 42240161 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42240289.

It is not an unprimeable number, because it can be changed into a prime (42240089) 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, 27742 + ... + 29224.

It is an arithmetic number, because the mean of its divisors is an integer number (3261832).

Almost surely, 2^42240289 is an apocalyptic number.

It is an amenable number.

42240289 is a deficient number, since it is larger than the sum of its proper divisors (9949023).

42240289 is a wasteful number, since it uses less digits than its factorization.

42240289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1816.

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 42240289 is about 6499.2529570713. The cubic root of 42240289 is about 348.2643019014.

The spelling of 42240289 in words is "forty-two million, two hundred forty thousand, two hundred eighty-nine".