40186291 has 2 divisors, whose sum is σ = 40186292. Its totient is φ = 40186290.

The previous prime is 40186277. The next prime is 40186327. The reversal of 40186291 is 19268104.

It is a happy number.

40186291 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40186291 is a prime.

It is a super-2 number, since 2×40186291² = 3229875968673362, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (40186231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20093145 + 20093146.

It is an arithmetic number, because the mean of its divisors is an integer number (20093146).

Almost surely, 2^40186291 is an apocalyptic number.

40186291 is a deficient number, since it is larger than the sum of its proper divisors (1).

40186291 is an equidigital number, since it uses as much as digits as its factorization.

40186291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 40186291 is about 6339.2658092243. The cubic root of 40186291 is about 342.5252891267.

The spelling of 40186291 in words is "forty million, one hundred eighty-six thousand, two hundred ninety-one".