40729919 has 4 divisors (see below), whose sum is σ = 41023080. Its totient is φ = 40436760.

The previous prime is 40729907. The next prime is 40729937. The reversal of 40729919 is 91992704.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 40729919 - 2¹² = 40725823 is a prime.

It is a super-2 number, since 2×40729919² = 3317852603493122, which contains 22 as substring.

It is a Duffinian 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, 146372 + ... + 146649.

It is an arithmetic number, because the mean of its divisors is an integer number (10255770).

Almost surely, 2^40729919 is an apocalyptic number.

40729919 is a deficient number, since it is larger than the sum of its proper divisors (293161).

40729919 is a wasteful number, since it uses less digits than its factorization.

40729919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293160.

The product of its (nonzero) digits is 40824, while the sum is 41.

The square root of 40729919 is about 6381.9996082733. Note that the first 3 decimals coincide. The cubic root of 40729919 is about 344.0629025723.

The spelling of 40729919 in words is "forty million, seven hundred twenty-nine thousand, nine hundred nineteen".