40427 has 2 divisors, whose sum is σ = 40428. Its totient is φ = 40426.

The previous prime is 40423. The next prime is 40429. The reversal of 40427 is 72404.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40427 - 2² = 40423 is a prime.

Together with 40429, it forms a pair of twin primes.

It is a Chen prime.

It is a magnanimous number.

It is equal to p₄₂₃₈ and since 40427 and 4238 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (40423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20213 + 20214.

It is an arithmetic number, because the mean of its divisors is an integer number (20214).

2⁴⁰⁴²⁷ is an apocalyptic number.

40427 is a deficient number, since it is larger than the sum of its proper divisors (1).

40427 is an equidigital number, since it uses as much as digits as its factorization.

40427 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 224, while the sum is 17.

The square root of 40427 is about 201.0646662146. The cubic root of 40427 is about 34.3207817464.

The spelling of 40427 in words is "forty thousand, four hundred twenty-seven", and thus it is an iban number.