40471721 has 4 divisors (see below), whose sum is σ = 40698000. Its totient is φ = 40245444.

The previous prime is 40471693. The next prime is 40471723. The reversal of 40471721 is 12717404.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40471721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40471723) 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, 112871 + ... + 113228.

It is an arithmetic number, because the mean of its divisors is an integer number (10174500).

Almost surely, 2^40471721 is an apocalyptic number.

It is an amenable number.

40471721 is a deficient number, since it is larger than the sum of its proper divisors (226279).

40471721 is a wasteful number, since it uses less digits than its factorization.

40471721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226278.

The product of its (nonzero) digits is 1568, while the sum is 26.

The square root of 40471721 is about 6361.7388346269. The cubic root of 40471721 is about 343.3343248366.

The spelling of 40471721 in words is "forty million, four hundred seventy-one thousand, seven hundred twenty-one".