40310021 has 4 divisors (see below), whose sum is σ = 40441632. Its totient is φ = 40178412.

The previous prime is 40309993. The next prime is 40310027. The reversal of 40310021 is 12001304.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 40310021 - 2⁶ = 40309957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40309984 and 40310011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40310027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65345 + ... + 65958.

It is an arithmetic number, because the mean of its divisors is an integer number (10110408).

Almost surely, 2^40310021 is an apocalyptic number.

It is an amenable number.

40310021 is a deficient number, since it is larger than the sum of its proper divisors (131611).

40310021 is a wasteful number, since it uses less digits than its factorization.

40310021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131610.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 40310021 is about 6349.0173255394. The cubic root of 40310021 is about 342.8764638831.

Adding to 40310021 its reverse (12001304), we get a palindrome (52311325).

The spelling of 40310021 in words is "forty million, three hundred ten thousand, twenty-one".