40688221 has 8 divisors (see below), whose sum is σ = 46609344. Its totient is φ = 34794240.

The previous prime is 40688201. The next prime is 40688237. The reversal of 40688221 is 12288604.

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

It is a cyclic number.

It is not a de Polignac number, because 40688221 - 2¹⁹ = 40163933 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 (40688201) 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, 3460 + ... + 9661.

It is an arithmetic number, because the mean of its divisors is an integer number (5826168).

Almost surely, 2^40688221 is an apocalyptic number.

It is an amenable number.

40688221 is a deficient number, since it is larger than the sum of its proper divisors (5921123).

40688221 is a wasteful number, since it uses less digits than its factorization.

40688221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13571.

The product of its (nonzero) digits is 6144, while the sum is 31.

The square root of 40688221 is about 6378.7319272721. The cubic root of 40688221 is about 343.9454489170.

The spelling of 40688221 in words is "forty million, six hundred eighty-eight thousand, two hundred twenty-one".