40129291 has 4 divisors (see below), whose sum is σ = 40339584. Its totient is φ = 39919000.

The previous prime is 40129289. The next prime is 40129337. The reversal of 40129291 is 19292104.

It is a happy number.

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

It is not a de Polignac number, because 40129291 - 2¹ = 40129289 is a prime.

It is a super-2 number, since 2×40129291² = 3220719992325362, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40129241) 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 in 3 ways as a sum of consecutive naturals, for example, 104860 + ... + 105241.

It is an arithmetic number, because the mean of its divisors is an integer number (10084896).

Almost surely, 2^40129291 is an apocalyptic number.

40129291 is a deficient number, since it is larger than the sum of its proper divisors (210293).

40129291 is a wasteful number, since it uses less digits than its factorization.

40129291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210292.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 40129291 is about 6334.7684251281. The cubic root of 40129291 is about 342.3632672103.

It can be divided in two parts, 401 and 29291, that added together give a palindrome (29692).

The spelling of 40129291 in words is "forty million, one hundred twenty-nine thousand, two hundred ninety-one".