40688039 has 4 divisors (see below), whose sum is σ = 46500624. Its totient is φ = 34875456.

The previous prime is 40688029. The next prime is 40688057. The reversal of 40688039 is 93088604.

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

It is a de Polignac number, because none of the positive numbers 2^k-40688039 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 40687993 and 40688011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40688029) 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, 2906282 + ... + 2906295.

It is an arithmetic number, because the mean of its divisors is an integer number (11625156).

Almost surely, 2^40688039 is an apocalyptic number.

40688039 is a deficient number, since it is larger than the sum of its proper divisors (5812585).

40688039 is an equidigital number, since it uses as much as digits as its factorization.

40688039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5812584.

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 40688039 is about 6378.7176610977. The cubic root of 40688039 is about 343.9449360891.

The spelling of 40688039 in words is "forty million, six hundred eighty-eight thousand, thirty-nine".