40145173 has 2 divisors, whose sum is σ = 40145174. Its totient is φ = 40145172.

The previous prime is 40145167. The next prime is 40145207. The reversal of 40145173 is 37154104.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40030929 + 114244 = 6327^2 + 338^2 .

It is a cyclic number.

It is not a de Polignac number, because 40145173 - 2¹³ = 40136981 is a prime.

It is a super-2 number, since 2×40145173² = 3223269830399858, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40145113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20072586 + 20072587.

It is an arithmetic number, because the mean of its divisors is an integer number (20072587).

Almost surely, 2^40145173 is an apocalyptic number.

It is an amenable number.

40145173 is a deficient number, since it is larger than the sum of its proper divisors (1).

40145173 is an equidigital number, since it uses as much as digits as its factorization.

40145173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 40145173 is about 6336.0218591795. The cubic root of 40145173 is about 342.4084270433.

Adding to 40145173 its reverse (37154104), we get a palindrome (77299277).

The spelling of 40145173 in words is "forty million, one hundred forty-five thousand, one hundred seventy-three".