40690129 has 4 divisors (see below), whose sum is σ = 43083684. Its totient is φ = 38296576.

The previous prime is 40690123. The next prime is 40690147. The reversal of 40690129 is 92109604.

It is a happy number.

40690129 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 can be written as a sum of positive squares in 2 ways, for example, as 34574400 + 6115729 = 5880^2 + 2473^2 .

It is a cyclic number.

It is not a de Polignac number, because 40690129 - 2⁹ = 40689617 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40690129.

It is not an unprimeable number, because it can be changed into a prime (40690123) 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, 1196752 + ... + 1196785.

It is an arithmetic number, because the mean of its divisors is an integer number (10770921).

Almost surely, 2^40690129 is an apocalyptic number.

It is an amenable number.

40690129 is a deficient number, since it is larger than the sum of its proper divisors (2393555).

40690129 is a wasteful number, since it uses less digits than its factorization.

40690129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2393554.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 40690129 is about 6378.8814850254. The cubic root of 40690129 is about 343.9508250647.

The spelling of 40690129 in words is "forty million, six hundred ninety thousand, one hundred twenty-nine".