40178129 has 2 divisors, whose sum is σ = 40178130. Its totient is φ = 40178128.

The previous prime is 40178087. The next prime is 40178143. The reversal of 40178129 is 92187104.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39753025 + 425104 = 6305^2 + 652^2 .

It is a cyclic number.

It is not a de Polignac number, because 40178129 - 2⁸ = 40177873 is a prime.

It is a super-2 number, since 2×40178129² = 3228564099881282, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 40178095 and 40178104.

It is not a weakly prime, because it can be changed into another prime (40178629) by changing a digit.

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

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20089064 + 20089065.

It is an arithmetic number, because the mean of its divisors is an integer number (20089065).

Almost surely, 2^40178129 is an apocalyptic number.

It is an amenable number.

40178129 is a deficient number, since it is larger than the sum of its proper divisors (1).

40178129 is an equidigital number, since it uses as much as digits as its factorization.

40178129 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 40178129 is about 6338.6220111314. The cubic root of 40178129 is about 342.5020981277.

The spelling of 40178129 in words is "forty million, one hundred seventy-eight thousand, one hundred twenty-nine".