40115423 has 2 divisors, whose sum is σ = 40115424.
Its totient is φ = 40115422.
The previous prime is 40115407. The next prime is 40115443. The reversal of 40115423 is 32451104.
It is an a-pointer prime, because the next prime (40115443) can be obtained adding 40115423 to its sum of digits (20).
It is a weak prime.
It is a cyclic number.
It is not a de Polignac number, because 40115423 - 24 = 40115407 is a prime.
It is a junction number, because it is equal to n+sod(n) for n = 40115395 and 40115404.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (40115443) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20057711 + 20057712.
It is an arithmetic number, because the mean of its divisors is an integer number (20057712).
Almost surely, 240115423 is an apocalyptic number.
40115423 is a deficient number, since it is larger than the sum of its proper divisors (1).
40115423 is an equidigital number, since it uses as much as digits as its factorization.
40115423 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 480, while the sum is 20.
The square root of 40115423 is about 6333.6737364661.
The cubic root of 40115423 is about 342.3238243602.
Adding to 40115423 its reverse (32451104), we get a palindrome (72566527).
The spelling of 40115423 in words is "forty million, one hundred fifteen thousand, four hundred twenty-three".