40145811 has 4 divisors (see below), whose sum is σ = 53527752. Its totient is φ = 26763872.

The previous prime is 40145801. The next prime is 40145813. The reversal of 40145811 is 11854104.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 40145811 - 2⁵ = 40145779 is a prime.

It is a super-2 number, since 2×40145811² = 3223372281695442, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (40145813) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6690966 + ... + 6690971.

It is an arithmetic number, because the mean of its divisors is an integer number (13381938).

Almost surely, 2^40145811 is an apocalyptic number.

40145811 is a deficient number, since it is larger than the sum of its proper divisors (13381941).

40145811 is a wasteful number, since it uses less digits than its factorization.

40145811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13381940.

The product of its (nonzero) digits is 640, while the sum is 24.

The square root of 40145811 is about 6336.0722060280. The cubic root of 40145811 is about 342.4102409220.

Adding to 40145811 its reverse (11854104), we get a palindrome (51999915).

The spelling of 40145811 in words is "forty million, one hundred forty-five thousand, eight hundred eleven".