40721587 has 8 divisors (see below), whose sum is σ = 41492880. Its totient is φ = 39953760.

The previous prime is 40721581. The next prime is 40721591. The reversal of 40721587 is 78512704.

It is a happy number.

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 40721587 - 2⁷ = 40721459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40721581) 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, 39693 + ... + 40705.

It is an arithmetic number, because the mean of its divisors is an integer number (5186610).

Almost surely, 2^40721587 is an apocalyptic number.

40721587 is a deficient number, since it is larger than the sum of its proper divisors (771293).

40721587 is a wasteful number, since it uses less digits than its factorization.

40721587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1733.

The product of its (nonzero) digits is 15680, while the sum is 34.

The square root of 40721587 is about 6381.3468014205. The cubic root of 40721587 is about 344.0394396596.

The spelling of 40721587 in words is "forty million, seven hundred twenty-one thousand, five hundred eighty-seven".