40145805 has 24 divisors (see below), whose sum is σ = 79527552. Its totient is φ = 18352224.

The previous prime is 40145801. The next prime is 40145813. The reversal of 40145805 is 50854104.

It is not a de Polignac number, because 40145805 - 2² = 40145801 is a prime.

It is a super-2 number, since 2×40145805² = 3223371318196050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40145801) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 63409 + ... + 64038.

It is an arithmetic number, because the mean of its divisors is an integer number (3313648).

Almost surely, 2^40145805 is an apocalyptic number.

40145805 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

40145805 is a deficient number, since it is larger than the sum of its proper divisors (39381747).

40145805 is a wasteful number, since it uses less digits than its factorization.

40145805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127465 (or 127462 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

The square root of 40145805 is about 6336.0717325485. The cubic root of 40145805 is about 342.4102238637.

Adding to 40145805 its reverse (50854104), we get a palindrome (90999909).

The spelling of 40145805 in words is "forty million, one hundred forty-five thousand, eight hundred five".