40042045 has 4 divisors (see below), whose sum is σ = 48050460. Its totient is φ = 32033632.

The previous prime is 40042043. The next prime is 40042099. The reversal of 40042045 is 54024004.

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

It can be written as a sum of positive squares in 2 ways, for example, as 23174596 + 16867449 = 4814^2 + 4107^2 .

It is a cyclic number.

It is not a de Polignac number, because 40042045 - 2¹ = 40042043 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40042043) 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, 4004200 + ... + 4004209.

It is an arithmetic number, because the mean of its divisors is an integer number (12012615).

Almost surely, 2^40042045 is an apocalyptic number.

It is an amenable number.

40042045 is a deficient number, since it is larger than the sum of its proper divisors (8008415).

40042045 is an equidigital number, since it uses as much as digits as its factorization.

40042045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8008414.

The product of its (nonzero) digits is 640, while the sum is 19.

The square root of 40042045 is about 6327.8783964296. The cubic root of 40042045 is about 342.1149739401.

Adding to 40042045 its reverse (54024004), we get a palindrome (94066049).

The spelling of 40042045 in words is "forty million, forty-two thousand, forty-five".