40663021 has 16 divisors (see below), whose sum is σ = 50117760. Its totient is φ = 32209920.

The previous prime is 40663013. The next prime is 40663043. The reversal of 40663021 is 12036604.

It is a cyclic number.

It is not a de Polignac number, because 40663021 - 2³ = 40663013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 40662983 and 40663001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40663001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1725 + ... + 9181.

It is an arithmetic number, because the mean of its divisors is an integer number (3132360).

Almost surely, 2^40663021 is an apocalyptic number.

40663021 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

40663021 is a deficient number, since it is larger than the sum of its proper divisors (9454739).

40663021 is a wasteful number, since it uses less digits than its factorization.

40663021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7524.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 40663021 is about 6376.7563070891. The cubic root of 40663021 is about 343.8744274183.

Adding to 40663021 its reverse (12036604), we get a palindrome (52699625).

The spelling of 40663021 in words is "forty million, six hundred sixty-three thousand, twenty-one".