40688629 has 4 divisors (see below), whose sum is σ = 40704460. Its totient is φ = 40672800.

The previous prime is 40688623. The next prime is 40688639. The reversal of 40688629 is 92688604.

It is a happy number.

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 13126129 + 27562500 = 3623^2 + 5250^2 .

It is a cyclic number.

It is not a de Polignac number, because 40688629 - 2⁵ = 40688597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40688623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3072 + ... + 9529.

It is an arithmetic number, because the mean of its divisors is an integer number (10176115).

Almost surely, 2^40688629 is an apocalyptic number.

It is an amenable number.

40688629 is a deficient number, since it is larger than the sum of its proper divisors (15831).

40688629 is a wasteful number, since it uses less digits than its factorization.

40688629 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15830.

The product of its (nonzero) digits is 165888, while the sum is 43.

The square root of 40688629 is about 6378.7639084700. The cubic root of 40688629 is about 343.9465985476.

The spelling of 40688629 in words is "forty million, six hundred eighty-eight thousand, six hundred twenty-nine".