40041993 has 4 divisors (see below), whose sum is σ = 53389328. Its totient is φ = 26694660.

The previous prime is 40041983. The next prime is 40041997. The reversal of 40041993 is 39914004.

40041993 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 40041993 - 2⁵ = 40041961 is a prime.

It is a super-2 number, since 2×40041993² = 3206722406824098, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 40041993.

It is not an unprimeable number, because it can be changed into a prime (40041997) 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 in 3 ways as a sum of consecutive naturals, for example, 6673663 + ... + 6673668.

It is an arithmetic number, because the mean of its divisors is an integer number (13347332).

Almost surely, 2^40041993 is an apocalyptic number.

It is an amenable number.

40041993 is a deficient number, since it is larger than the sum of its proper divisors (13347335).

40041993 is a wasteful number, since it uses less digits than its factorization.

40041993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13347334.

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 40041993 is about 6327.8742876261. The cubic root of 40041993 is about 342.1148258458.

Adding to 40041993 its reverse (39914004), we get a palindrome (79955997).

The spelling of 40041993 in words is "forty million, forty-one thousand, nine hundred ninety-three".