40129231 has 4 divisors (see below), whose sum is σ = 42489792. Its totient is φ = 37768672.

The previous prime is 40129223. The next prime is 40129237. The reversal of 40129231 is 13292104.

40129231 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 40129231 - 2³ = 40129223 is a prime.

It is a super-2 number, since 2×40129231² = 3220710361302722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40129237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1180255 + ... + 1180288.

It is an arithmetic number, because the mean of its divisors is an integer number (10622448).

Almost surely, 2^40129231 is an apocalyptic number.

40129231 is a deficient number, since it is larger than the sum of its proper divisors (2360561).

40129231 is a wasteful number, since it uses less digits than its factorization.

40129231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2360560.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 40129231 is about 6334.7636893573. The cubic root of 40129231 is about 342.3630965801.

The spelling of 40129231 in words is "forty million, one hundred twenty-nine thousand, two hundred thirty-one".