40021023 has 16 divisors (see below), whose sum is σ = 61721856. Its totient is φ = 22592640.

The previous prime is 40021021. The next prime is 40021061. The reversal of 40021023 is 32012004.

40021023 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 40021023 - 2¹ = 40021021 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40021021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9738 + ... + 13223.

It is an arithmetic number, because the mean of its divisors is an integer number (3857616).

Almost surely, 2^40021023 is an apocalyptic number.

40021023 is a deficient number, since it is larger than the sum of its proper divisors (21700833).

40021023 is a wasteful number, since it uses less digits than its factorization.

40021023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23054.

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 40021023 is about 6326.2171160971. The cubic root of 40021023 is about 342.0550935491.

Adding to 40021023 its reverse (32012004), we get a palindrome (72033027).

The spelling of 40021023 in words is "forty million, twenty-one thousand, twenty-three".