40168445 has 4 divisors (see below), whose sum is σ = 48202140. Its totient is φ = 32134752.

The previous prime is 40168411. The next prime is 40168477. The reversal of 40168445 is 54486104.

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 19909444 + 20259001 = 4462^2 + 4501^2 .

It is a cyclic number.

It is not a de Polignac number, because 40168445 - 2¹² = 40164349 is a prime.

It is a super-2 number, since 2×40168445² = 3227007947436050, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4016840 + ... + 4016849.

It is an arithmetic number, because the mean of its divisors is an integer number (12050535).

Almost surely, 2^40168445 is an apocalyptic number.

It is an amenable number.

40168445 is a deficient number, since it is larger than the sum of its proper divisors (8033695).

40168445 is an equidigital number, since it uses as much as digits as its factorization.

40168445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8033694.

The product of its (nonzero) digits is 15360, while the sum is 32.

The square root of 40168445 is about 6337.8580766691. The cubic root of 40168445 is about 342.4745785384.

The spelling of 40168445 in words is "forty million, one hundred sixty-eight thousand, four hundred forty-five".