40386591 has 12 divisors (see below), whose sum is σ = 66670032. Its totient is φ = 23078016.

The previous prime is 40386587. The next prime is 40386607. The reversal of 40386591 is 19568304.

It is not a de Polignac number, because 40386591 - 2² = 40386587 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40386581) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 320466 + ... + 320591.

It is an arithmetic number, because the mean of its divisors is an integer number (5555836).

Almost surely, 2^40386591 is an apocalyptic number.

40386591 is a deficient number, since it is larger than the sum of its proper divisors (26283441).

40386591 is a wasteful number, since it uses less digits than its factorization.

40386591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 641070 (or 641067 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 40386591 is about 6355.0445317086. The cubic root of 40386591 is about 343.0934276742.

The spelling of 40386591 in words is "forty million, three hundred eighty-six thousand, five hundred ninety-one".