40219729 has 16 divisors (see below), whose sum is σ = 45251136. Its totient is φ = 35430400.

The previous prime is 40219721. The next prime is 40219747. The reversal of 40219729 is 92791204.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 40219729 - 2³ = 40219721 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40219694 and 40219703.

It is not an unprimeable number, because it can be changed into a prime (40219721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 115734 + ... + 116080.

It is an arithmetic number, because the mean of its divisors is an integer number (2828196).

Almost surely, 2^40219729 is an apocalyptic number.

It is an amenable number.

40219729 is a deficient number, since it is larger than the sum of its proper divisors (5031407).

40219729 is a wasteful number, since it uses less digits than its factorization.

40219729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 656.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 40219729 is about 6341.9026324913. The cubic root of 40219729 is about 342.6202650096.

The spelling of 40219729 in words is "forty million, two hundred nineteen thousand, seven hundred twenty-nine".