40013191 has 4 divisors (see below), whose sum is σ = 40039272. Its totient is φ = 39987112.

The previous prime is 40013173. The next prime is 40013201. The reversal of 40013191 is 19131004.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 40013191 - 2¹³ = 40004999 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 (40013111) 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, 10585 + ... + 13858.

It is an arithmetic number, because the mean of its divisors is an integer number (10009818).

Almost surely, 2^40013191 is an apocalyptic number.

40013191 is a deficient number, since it is larger than the sum of its proper divisors (26081).

40013191 is a wasteful number, since it uses less digits than its factorization.

40013191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26080.

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 40013191 is about 6325.5980744907. The cubic root of 40013191 is about 342.0327790248.

Adding to 40013191 its reverse (19131004), we get a palindrome (59144195).

It can be divided in two parts, 40013 and 191, that added together give a palindrome (40204).

The spelling of 40013191 in words is "forty million, thirteen thousand, one hundred ninety-one".