40020523 has 2 divisors, whose sum is σ = 40020524. Its totient is φ = 40020522.

The previous prime is 40020521. The next prime is 40020527. The reversal of 40020523 is 32502004.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40020523 - 2¹ = 40020521 is a prime.

It is a super-2 number, since 2×40020523² = 3203284522387058, which contains 22 as substring.

Together with 40020521, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 40020497 and 40020506.

It is not a weakly prime, because it can be changed into another prime (40020521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20010261 + 20010262.

It is an arithmetic number, because the mean of its divisors is an integer number (20010262).

Almost surely, 2^40020523 is an apocalyptic number.

40020523 is a deficient number, since it is larger than the sum of its proper divisors (1).

40020523 is an equidigital number, since it uses as much as digits as its factorization.

40020523 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 240, while the sum is 16.

The square root of 40020523 is about 6326.1775978864. The cubic root of 40020523 is about 342.0536690622.

Adding to 40020523 its reverse (32502004), we get a palindrome (72522527).

The spelling of 40020523 in words is "forty million, twenty thousand, five hundred twenty-three".