40729791 has 4 divisors (see below), whose sum is σ = 54306392. Its totient is φ = 27153192.

The previous prime is 40729783. The next prime is 40729813. The reversal of 40729791 is 19792704.

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

It is not a de Polignac number, because 40729791 - 2³ = 40729783 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40729721) 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, 6788296 + ... + 6788301.

It is an arithmetic number, because the mean of its divisors is an integer number (13576598).

Almost surely, 2^40729791 is an apocalyptic number.

40729791 is a deficient number, since it is larger than the sum of its proper divisors (13576601).

40729791 is a wasteful number, since it uses less digits than its factorization.

40729791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13576600.

The product of its (nonzero) digits is 31752, while the sum is 39.

The square root of 40729791 is about 6381.9895800604. The cubic root of 40729791 is about 344.0625421485.

The spelling of 40729791 in words is "forty million, seven hundred twenty-nine thousand, seven hundred ninety-one".