40020923 has 8 divisors (see below), whose sum is σ = 40964160. Its totient is φ = 39081600.

The previous prime is 40020913. The next prime is 40020949. The reversal of 40020923 is 32902004.

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 40020923 - 2¹⁸ = 39758779 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40020895 and 40020904.

It is not an unprimeable number, because it can be changed into a prime (40020913) 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, 32723 + ... + 33923.

It is an arithmetic number, because the mean of its divisors is an integer number (5120520).

Almost surely, 2^40020923 is an apocalyptic number.

40020923 is a deficient number, since it is larger than the sum of its proper divisors (943237).

40020923 is a wasteful number, since it uses less digits than its factorization.

40020923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1957.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 40020923 is about 6326.2092124747. The cubic root of 40020923 is about 342.0548086526.

Adding to 40020923 its reverse (32902004), we get a palindrome (72922927).

The spelling of 40020923 in words is "forty million, twenty thousand, nine hundred twenty-three".