40128659 has 2 divisors, whose sum is σ = 40128660. Its totient is φ = 40128658.

The previous prime is 40128643. The next prime is 40128679. The reversal of 40128659 is 95682104.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40128659 - 2⁴ = 40128643 is a prime.

It is a super-2 number, since 2×40128659² = 3220618546276562, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (40128679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20064329 + 20064330.

It is an arithmetic number, because the mean of its divisors is an integer number (20064330).

Almost surely, 2^40128659 is an apocalyptic number.

40128659 is a deficient number, since it is larger than the sum of its proper divisors (1).

40128659 is an equidigital number, since it uses as much as digits as its factorization.

40128659 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 40128659 is about 6334.7185414981. The cubic root of 40128659 is about 342.3614698970.

The spelling of 40128659 in words is "forty million, one hundred twenty-eight thousand, six hundred fifty-nine".