42688427 has 4 divisors (see below), whose sum is σ = 42767016. Its totient is φ = 42609840.

The previous prime is 42688423. The next prime is 42688441. The reversal of 42688427 is 72488624.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 42688427 - 2² = 42688423 is a prime.

It is a super-3 number, since 3×42688427³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42688423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38474 + ... + 39567.

It is an arithmetic number, because the mean of its divisors is an integer number (10691754).

Almost surely, 2^42688427 is an apocalyptic number.

42688427 is a deficient number, since it is larger than the sum of its proper divisors (78589).

42688427 is an equidigital number, since it uses as much as digits as its factorization.

42688427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78588.

The product of its digits is 172032, while the sum is 41.

The square root of 42688427 is about 6533.6381136393. The cubic root of 42688427 is about 349.4915801801.

The spelling of 42688427 in words is "forty-two million, six hundred eighty-eight thousand, four hundred twenty-seven".