40359721 has 4 divisors (see below), whose sum is σ = 40411792. Its totient is φ = 40307652.

The previous prime is 40359673. The next prime is 40359769. The reversal of 40359721 is 12795304.

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 an interprime number because it is at equal distance from previous prime (40359673) and next prime (40359769).

It is a cyclic number.

It is not a de Polignac number, because 40359721 - 2¹⁷ = 40228649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40359421) 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, 24855 + ... + 26428.

It is an arithmetic number, because the mean of its divisors is an integer number (10102948).

Almost surely, 2^40359721 is an apocalyptic number.

It is an amenable number.

40359721 is a deficient number, since it is larger than the sum of its proper divisors (52071).

40359721 is an equidigital number, since it uses as much as digits as its factorization.

40359721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52070.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 40359721 is about 6352.9301113738. The cubic root of 40359721 is about 343.0173218394.

The spelling of 40359721 in words is "forty million, three hundred fifty-nine thousand, seven hundred twenty-one".