42320289 has 16 divisors (see below), whose sum is σ = 62302464. Its totient is φ = 25338000.

The previous prime is 42320279. The next prime is 42320297. The reversal of 42320289 is 98202324.

It is not a de Polignac number, because 42320289 - 2⁴ = 42320273 is a prime.

It is a super-2 number, since 2×42320289² = 3582013722087042, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (42320249) 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, 4987 + ... + 10464.

It is an arithmetic number, because the mean of its divisors is an integer number (3893904).

Almost surely, 2^42320289 is an apocalyptic number.

It is an amenable number.

42320289 is a deficient number, since it is larger than the sum of its proper divisors (19982175).

42320289 is a wasteful number, since it uses less digits than its factorization.

42320289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15548.

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 42320289 is about 6505.4045992544. The cubic root of 42320289 is about 348.4840255689.

The spelling of 42320289 in words is "forty-two million, three hundred twenty thousand, two hundred eighty-nine".