40187317 has 2 divisors, whose sum is σ = 40187318. Its totient is φ = 40187316.

The previous prime is 40187311. The next prime is 40187341. The reversal of 40187317 is 71378104.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35688676 + 4498641 = 5974^2 + 2121^2 .

It is a cyclic number.

It is not a de Polignac number, because 40187317 - 2²³ = 31798709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40187311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20093658 + 20093659.

It is an arithmetic number, because the mean of its divisors is an integer number (20093659).

Almost surely, 2^40187317 is an apocalyptic number.

It is an amenable number.

40187317 is a deficient number, since it is larger than the sum of its proper divisors (1).

40187317 is an equidigital number, since it uses as much as digits as its factorization.

40187317 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4704, while the sum is 31.

The square root of 40187317 is about 6339.3467329055. The cubic root of 40187317 is about 342.5282041171.

It can be divided in two parts, 40187 and 317, that added together give a palindrome (40504).

The spelling of 40187317 in words is "forty million, one hundred eighty-seven thousand, three hundred seventeen".