40721966 has 8 divisors (see below), whose sum is σ = 61209840. Its totient is φ = 20318688.

The previous prime is 40721929. The next prime is 40721969. The reversal of 40721966 is 66912704.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40721969) 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, 19931 + ... + 21878.

It is an arithmetic number, because the mean of its divisors is an integer number (7651230).

Almost surely, 2^40721966 is an apocalyptic number.

40721966 is a deficient number, since it is larger than the sum of its proper divisors (20487874).

40721966 is a wasteful number, since it uses less digits than its factorization.

40721966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42298.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 40721966 is about 6381.3764972771. The cubic root of 40721966 is about 344.0405069931.

The spelling of 40721966 in words is "forty million, seven hundred twenty-one thousand, nine hundred sixty-six".