40045005 has 144 divisors (see below), whose sum is σ = 95606784. Its totient is φ = 15240960.

The previous prime is 40045003. The next prime is 40045007. The reversal of 40045005 is 50054004.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (40045003) and next prime (40045007).

It is not a de Polignac number, because 40045005 - 2¹ = 40045003 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40045003) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 315252 + ... + 315378.

It is an arithmetic number, because the mean of its divisors is an integer number (663936).

Almost surely, 2^40045005 is an apocalyptic number.

40045005 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

40045005 is an abundant number, since it is smaller than the sum of its proper divisors (55561779).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

40045005 is a wasteful number, since it uses less digits than its factorization.

40045005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176 (or 166 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 18.

The square root of 40045005 is about 6328.1122777650. The cubic root of 40045005 is about 342.1234037074.

Adding to 40045005 its reverse (50054004), we get a palindrome (90099009).

It can be divided in two parts, 4004 and 5005, that added together give a palindrome (9009).

The spelling of 40045005 in words is "forty million, forty-five thousand, five".