42720307 has 16 divisors (see below), whose sum is σ = 50688000. Its totient is φ = 35979720.

The previous prime is 42720283. The next prime is 42720323. The reversal of 42720307 is 70302724.

It is not a de Polignac number, because 42720307 - 2¹¹ = 42718259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42720347) 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, 19182 + ... + 21292.

It is an arithmetic number, because the mean of its divisors is an integer number (3168000).

Almost surely, 2^42720307 is an apocalyptic number.

42720307 is a deficient number, since it is larger than the sum of its proper divisors (7967693).

42720307 is an equidigital number, since it uses as much as digits as its factorization.

42720307 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2191 (or 2177 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 25.

The square root of 42720307 is about 6536.0773404237. The cubic root of 42720307 is about 349.5785594070.

The spelling of 42720307 in words is "forty-two million, seven hundred twenty thousand, three hundred seven".