42720427 has 2 divisors, whose sum is σ = 42720428. Its totient is φ = 42720426.

The previous prime is 42720389. The next prime is 42720497. The reversal of 42720427 is 72402724.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42720427 - 2¹⁹ = 42196139 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42720395 and 42720404.

It is not a weakly prime, because it can be changed into another prime (42720497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21360213 + 21360214.

It is an arithmetic number, because the mean of its divisors is an integer number (21360214).

Almost surely, 2^42720427 is an apocalyptic number.

42720427 is a deficient number, since it is larger than the sum of its proper divisors (1).

42720427 is an equidigital number, since it uses as much as digits as its factorization.

42720427 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6272, while the sum is 28.

The square root of 42720427 is about 6536.0865202352. The cubic root of 42720427 is about 349.5788867251.

The spelling of 42720427 in words is "forty-two million, seven hundred twenty thousand, four hundred twenty-seven".