40721679 has 6 divisors (see below), whose sum is σ = 58820216. Its totient is φ = 27147780.

The previous prime is 40721641. The next prime is 40721689. The reversal of 40721679 is 97612704.

It is a happy number.

It is not a de Polignac number, because 40721679 - 2⁹ = 40721167 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 (40721609) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2262307 + ... + 2262324.

Almost surely, 2^40721679 is an apocalyptic number.

40721679 is a deficient number, since it is larger than the sum of its proper divisors (18098537).

40721679 is a wasteful number, since it uses less digits than its factorization.

40721679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4524637 (or 4524634 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

The square root of 40721679 is about 6381.3540099261. The cubic root of 40721679 is about 344.0396987491.

The spelling of 40721679 in words is "forty million, seven hundred twenty-one thousand, six hundred seventy-nine".