40729989 has 4 divisors (see below), whose sum is σ = 54306656. Its totient is φ = 27153324.

The previous prime is 40729979. The next prime is 40729991. The reversal of 40729989 is 98992704.

It is a happy number.

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 not a de Polignac number, because 40729989 - 2⁵ = 40729957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40729979) 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, 6788329 + ... + 6788334.

It is an arithmetic number, because the mean of its divisors is an integer number (13576664).

Almost surely, 2^40729989 is an apocalyptic number.

It is an amenable number.

40729989 is a deficient number, since it is larger than the sum of its proper divisors (13576667).

40729989 is a wasteful number, since it uses less digits than its factorization.

40729989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13576666.

The product of its (nonzero) digits is 326592, while the sum is 48.

The square root of 40729989 is about 6382.0050924455. The cubic root of 40729989 is about 344.0630996788.

The spelling of 40729989 in words is "forty million, seven hundred twenty-nine thousand, nine hundred eighty-nine".