40405559 has 2 divisors, whose sum is σ = 40405560. Its totient is φ = 40405558.

The previous prime is 40405543. The next prime is 40405601. The reversal of 40405559 is 95550404.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40405559 - 2⁴ = 40405543 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40405529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20202779 + 20202780.

It is an arithmetic number, because the mean of its divisors is an integer number (20202780).

Almost surely, 2^40405559 is an apocalyptic number.

40405559 is a deficient number, since it is larger than the sum of its proper divisors (1).

40405559 is an equidigital number, since it uses as much as digits as its factorization.

40405559 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18000, while the sum is 32.

The square root of 40405559 is about 6356.5367142808. The cubic root of 40405559 is about 343.1471317826.

The spelling of 40405559 in words is "forty million, four hundred five thousand, five hundred fifty-nine".