40395791 has 16 divisors (see below), whose sum is σ = 44424864. Its totient is φ = 36578304.

The previous prime is 40395787. The next prime is 40395793. The reversal of 40395791 is 19759304.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 40395791 - 2² = 40395787 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40395793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52985 + ... + 53741.

It is an arithmetic number, because the mean of its divisors is an integer number (2776554).

Almost surely, 2^40395791 is an apocalyptic number.

40395791 is a deficient number, since it is larger than the sum of its proper divisors (4029073).

40395791 is a wasteful number, since it uses less digits than its factorization.

40395791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 890.

The product of its (nonzero) digits is 34020, while the sum is 38.

The square root of 40395791 is about 6355.7683249156. The cubic root of 40395791 is about 343.1194777386.

The spelling of 40395791 in words is "forty million, three hundred ninety-five thousand, seven hundred ninety-one".