40081393 has 32 divisors (see below), whose sum is σ = 50544000. Its totient is φ = 31288320.

The previous prime is 40081381. The next prime is 40081399. The reversal of 40081393 is 39318004.

It is a cyclic number.

It is not a de Polignac number, because 40081393 - 2²¹ = 37984241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40081399) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 102843 + ... + 103231.

It is an arithmetic number, because the mean of its divisors is an integer number (1579500).

Almost surely, 2^40081393 is an apocalyptic number.

It is an amenable number.

40081393 is a deficient number, since it is larger than the sum of its proper divisors (10462607).

40081393 is a wasteful number, since it uses less digits than its factorization.

40081393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 465.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 40081393 is about 6330.9867319400. The cubic root of 40081393 is about 342.2269989627.

Adding to 40081393 its reverse (39318004), we get a palindrome (79399397).

The spelling of 40081393 in words is "forty million, eighty-one thousand, three hundred ninety-three".