40129169 has 4 divisors (see below), whose sum is σ = 40145844. Its totient is φ = 40112496.

The previous prime is 40129153. The next prime is 40129171. The reversal of 40129169 is 96192104.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 23425600 + 16703569 = 4840^2 + 4087^2 .

It is a cyclic number.

It is not a de Polignac number, because 40129169 - 2⁴ = 40129153 is a prime.

It is a super-2 number, since 2×40129169² = 3220700409261122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40129189) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3962 + ... + 9795.

It is an arithmetic number, because the mean of its divisors is an integer number (10036461).

Almost surely, 2^40129169 is an apocalyptic number.

It is an amenable number.

40129169 is a deficient number, since it is larger than the sum of its proper divisors (16675).

40129169 is a wasteful number, since it uses less digits than its factorization.

40129169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16674.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 40129169 is about 6334.7587957238. The cubic root of 40129169 is about 342.3629202621.

The spelling of 40129169 in words is "forty million, one hundred twenty-nine thousand, one hundred sixty-nine".