40386691 has 2 divisors, whose sum is σ = 40386692. Its totient is φ = 40386690.

The previous prime is 40386667. The next prime is 40386701. The reversal of 40386691 is 19668304.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40386691 - 2¹⁵ = 40353923 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40386691.

It is not a weakly prime, because it can be changed into another prime (40386631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20193345 + 20193346.

It is an arithmetic number, because the mean of its divisors is an integer number (20193346).

Almost surely, 2^40386691 is an apocalyptic number.

40386691 is a deficient number, since it is larger than the sum of its proper divisors (1).

40386691 is an equidigital number, since it uses as much as digits as its factorization.

40386691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 40386691 is about 6355.0523994693. The cubic root of 40386691 is about 343.0937108483.

The spelling of 40386691 in words is "forty million, three hundred eighty-six thousand, six hundred ninety-one".