40340340391 has 6 divisors (see below), whose sum is σ = 43682143920. Its totient is φ = 37237237128.

The previous prime is 40340340377. The next prime is 40340340431. The reversal of 40340340391 is 19304304304.

It is not a de Polignac number, because 40340340391 - 2⁷ = 40340340263 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 (40340347391) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 119349951 + ... + 119350288.

It is an arithmetic number, because the mean of its divisors is an integer number (7280357320).

Almost surely, 2^40340340391 is an apocalyptic number.

40340340391 is a deficient number, since it is larger than the sum of its proper divisors (3341803529).

40340340391 is a wasteful number, since it uses less digits than its factorization.

40340340391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238700265 (or 238700252 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 31.

Adding to 40340340391 its reverse (19304304304), we get a palindrome (59644644695).

The spelling of 40340340391 in words is "forty billion, three hundred forty million, three hundred forty thousand, three hundred ninety-one".