40145815 has 8 divisors (see below), whose sum is σ = 48499200. Its totient is φ = 31900512.

The previous prime is 40145813. The next prime is 40145821. The reversal of 40145815 is 51854104.

40145815 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 40145815 - 2¹ = 40145813 is a prime.

It is a super-2 number, since 2×40145815² = 3223372924028450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40145813) 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 7 ways as a sum of consecutive naturals, for example, 26199 + ... + 27688.

It is an arithmetic number, because the mean of its divisors is an integer number (6062400).

Almost surely, 2^40145815 is an apocalyptic number.

40145815 is a deficient number, since it is larger than the sum of its proper divisors (8353385).

40145815 is a wasteful number, since it uses less digits than its factorization.

40145815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54041.

The product of its (nonzero) digits is 3200, while the sum is 28.

The square root of 40145815 is about 6336.0725216809. The cubic root of 40145815 is about 342.4102522942.

Adding to 40145815 its reverse (51854104), we get a palindrome (91999919).

The spelling of 40145815 in words is "forty million, one hundred forty-five thousand, eight hundred fifteen".