40728291 has 8 divisors (see below), whose sum is σ = 54344784. Its totient is φ = 27132000.

The previous prime is 40728287. The next prime is 40728299. The reversal of 40728291 is 19282704.

It is a happy number.

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

It is not a de Polignac number, because 40728291 - 2² = 40728287 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40728299) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 541 + ... + 9041.

It is an arithmetic number, because the mean of its divisors is an integer number (6793098).

Almost surely, 2^40728291 is an apocalyptic number.

40728291 is a deficient number, since it is larger than the sum of its proper divisors (13616493).

40728291 is a wasteful number, since it uses less digits than its factorization.

40728291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10101.

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 40728291 is about 6381.8720607671. The cubic root of 40728291 is about 344.0583183757.

The spelling of 40728291 in words is "forty million, seven hundred twenty-eight thousand, two hundred ninety-one".