40439929 has 4 divisors (see below), whose sum is σ = 40517776. Its totient is φ = 40362084.

The previous prime is 40439879. The next prime is 40439939. The reversal of 40439929 is 92993404.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 40439929 - 2⁹ = 40439417 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40439891 and 40439900.

It is not an unprimeable number, because it can be changed into a prime (40439939) 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, 38139 + ... + 39184.

It is an arithmetic number, because the mean of its divisors is an integer number (10129444).

Almost surely, 2^40439929 is an apocalyptic number.

It is an amenable number.

40439929 is a deficient number, since it is larger than the sum of its proper divisors (77847).

40439929 is an equidigital number, since it uses as much as digits as its factorization.

40439929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77846.

The product of its (nonzero) digits is 69984, while the sum is 40.

The square root of 40439929 is about 6359.2396558079. The cubic root of 40439929 is about 343.2444007781.

The spelling of 40439929 in words is "forty million, four hundred thirty-nine thousand, nine hundred twenty-nine".