40404193 has 4 divisors (see below), whose sum is σ = 40547248. Its totient is φ = 40261140.

The previous prime is 40404173. The next prime is 40404209. The reversal of 40404193 is 39140404.

It is a happy number.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40404193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40404173) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71103 + ... + 71668.

It is an arithmetic number, because the mean of its divisors is an integer number (10136812).

Almost surely, 2^40404193 is an apocalyptic number.

It is an amenable number.

40404193 is a deficient number, since it is larger than the sum of its proper divisors (143055).

40404193 is a wasteful number, since it uses less digits than its factorization.

40404193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143054.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 40404193 is about 6356.4292649254. The cubic root of 40404193 is about 343.1432647877.

Adding to 40404193 its reverse (39140404), we get a palindrome (79544597).

The spelling of 40404193 in words is "forty million, four hundred four thousand, one hundred ninety-three".