40023793 has 2 divisors, whose sum is σ = 40023794. Its totient is φ = 40023792.

The previous prime is 40023791. The next prime is 40023811. The reversal of 40023793 is 39732004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30824704 + 9199089 = 5552^2 + 3033^2 .

It is a cyclic number.

It is not a de Polignac number, because 40023793 - 2¹ = 40023791 is a prime.

It is a super-2 number, since 2×40023793² = 3203808012213698, which contains 22 as substring.

Together with 40023791, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (40023791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20011896 + 20011897.

It is an arithmetic number, because the mean of its divisors is an integer number (20011897).

Almost surely, 2^40023793 is an apocalyptic number.

It is an amenable number.

40023793 is a deficient number, since it is larger than the sum of its proper divisors (1).

40023793 is an equidigital number, since it uses as much as digits as its factorization.

40023793 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 28.

The square root of 40023793 is about 6326.4360425124. The cubic root of 40023793 is about 342.0629849911.

Adding to 40023793 its reverse (39732004), we get a palindrome (79755797).

The spelling of 40023793 in words is "forty million, twenty-three thousand, seven hundred ninety-three".