40420729 has 8 divisors (see below), whose sum is σ = 42298560. Its totient is φ = 38552976.

The previous prime is 40420717. The next prime is 40420741. The reversal of 40420729 is 92702404.

40420729 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (40420717) and next prime (40420741).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 40420729 - 2⁵ = 40420697 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40420697 and 40420706.

It is not an unprimeable number, because it can be changed into a prime (40420529) 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 7 ways as a sum of consecutive naturals, for example, 6399 + ... + 11035.

It is an arithmetic number, because the mean of its divisors is an integer number (5287320).

Almost surely, 2^40420729 is an apocalyptic number.

It is an amenable number.

40420729 is a deficient number, since it is larger than the sum of its proper divisors (1877831).

40420729 is a wasteful number, since it uses less digits than its factorization.

40420729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5039.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 40420729 is about 6357.7298621442. The cubic root of 40420729 is about 343.1900705167.

The spelling of 40420729 in words is "forty million, four hundred twenty thousand, seven hundred twenty-nine".