40129799 has 2 divisors, whose sum is σ = 40129800. Its totient is φ = 40129798.

The previous prime is 40129787. The next prime is 40129811. The reversal of 40129799 is 99792104.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (40129787) and next prime (40129811).

It is a cyclic number.

It is not a de Polignac number, because 40129799 - 2⁴ = 40129783 is a prime.

It is a super-2 number, since 2×40129799² = 3220801535560802, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40129759) 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, 20064899 + 20064900.

It is an arithmetic number, because the mean of its divisors is an integer number (20064900).

Almost surely, 2^40129799 is an apocalyptic number.

40129799 is a deficient number, since it is larger than the sum of its proper divisors (1).

40129799 is an equidigital number, since it uses as much as digits as its factorization.

40129799 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40824, while the sum is 41.

The square root of 40129799 is about 6334.8085211788. The cubic root of 40129799 is about 342.3647118725.

The spelling of 40129799 in words is "forty million, one hundred twenty-nine thousand, seven hundred ninety-nine".